fix(mock): global seed flag is ignored

[adrienaury]

		mask	mock	xml	parquet	play	jsonschema	flow
	--buffer-size	used	should	should	used	should	not used	not used
-e	--catch-errors	used	could	used	used	not used	not used	not used
	--color	used	used	used	used	used	could	could
-c	--config	used	used	not used	used	not used	not used	used
	--debug	used	used	used	used	used	could	could
	--dump-cache	used	should	used	used	could	not used	not used
	--empty-input	used	not used	used	used	not used	not used	not used
-h	--help	used	used	used	used	used	used	used
	--load-cache	used	should	used	used	could	not used	not used
	--log-json	used	used	used	used	used	could	could
-m	--mask	used	not used	not used	used	not used	not used	not used
	--pprof	used	could	could	used	not used	not used	not used
-r	--repeat	used	not used	used	used	not used	not used	not used
	--repeat-until	used	not used	used	used	not used	not used	not used
	--repeat-while	used	not used	used	used	not used	not used	not used
-s	--seed	used	used	used	used	not used	not used	not used
	--serve	used	not used	not used	used	not used	not used	not used
	--skip-field-on-error	used	could	used	used	not used	not used	not used
	--skip-line-on-error	used	could	used	used	not used	not used	not used
	--skip-log-file	used	could	used	used	not used	not used	not used
	--stats	used	could	could	used	not used	not used	not used
	--statsTemplate	used	could	could	used	not used	not used	not used
-v	--verbosity	used	used	used	used	used	could	could
	--version	used	not used	not used	not used	not used	not used	not used

[adrienaury]

Fixed :

		mask	mock	xml	parquet	play	jsonschema	flow
	--buffer-size	used	used	used	used	used	not used	not used
-e	--catch-errors	used	could	used	used	not used	not used	not used
	--color	used	used	used	used	used	used	used
-c	--config	used	used	not used	used	not used	not used	used
	--debug	used	used	used	used	used	used	used
	--dump-cache	used	could	used	used	could	not used	not used
	--empty-input	used	not used	not used	not used	not used	not used	not used
-h	--help	used	used	used	used	used	used	used
	--load-cache	used	used	used	used	could	not used	not used
	--log-json	used	used	used	used	used	used	used
-m	--mask	used	not used	not used	used	not used	not used	not used
	--pprof	used	could	could	used	not used	not used	not used
-r	--repeat	used	not used	not used	not used	not used	not used	not used
	--repeat-until	used	not used	not used	not used	not used	not used	not used
	--repeat-while	used	not used	not used	not used	not used	not used	not used
-s	--seed	used	used	used	used	not used	not used	not used
	--serve	used	not used	not used	not used	not used	not used	not used
	--skip-field-on-error	used	could	used	used	not used	not used	not used
	--skip-line-on-error	used	could	used	used	not used	not used	not used
	--skip-log-file	used	could	used	used	not used	not used	not used
	--stats	used	could	could	used	not used	not used	not used
	--statsTemplate	used	could	could	used	not used	not used	not used
-v	--verbosity	used	used	used	used	used	used	used
	--version	used	not used	not used	not used	not used	not used	not used