Preserve Unix line endings for .bash and .flags files
Fixes
# Shell scripts need Unix line endings (see https://github.com/gbdev/rgbds/issues/841)
*.sh text eol=lf
+*.bash text eol=lf
+
+# Flags also need Unix line endings (see https://github.com/gbdev/rgbds/issues/955)
+*.flags text eol=lf
