A couple minor fixes for Flymake diagnostics#4435

Open

brownts wants to merge 2 commits intoemacs-lsp:masterfrom brownts:bugfix/flymake-diagnostic

+57-33

Commits on Apr 20, 2024

Fix Flymake diagnostic column off-by-one error.
brownts
committed

Commits on Apr 23, 2024

Add a defcustom to control default diagnostic severity.
brownts
committed