Preserve homograph marker

[u06cgqm6]

ssi_morphology/morphological_analysis_workshop.ipynb

Line 211 in c6b5034

" seq = seq.replace(\"=\", \"\").replace(\":a\", \"a\").replace(\":c\", \"c\").replace(\":d\", \"d\").replace(\":du\", \"du\")\n",

The '=' should never be removed, because it distinguishes paradigmatic forms. Without it we can, for instance, no longer tell -IJM from -AJIM (plural from dual) or !T! from !T=! (2 m from 3 f).