Update TeX.gitignore

Adding `*.bbl-SAVE-ERROR` to `gitignore` for LaTeX.

TeX.gitignore

@@ -26,6 +26,7 @@
 
 ## Bibliography auxiliary files (bibtex/biblatex/biber):
 *.bbl
+*.bbl-SAVE-ERROR
 *.bcf
 *.blg
 *-blx.aux