[template] don't compile highlighters test-data

for syntax-highlighting submodule. See discussion on
https://github.com/zsh-users/zsh-syntax-highlighting/pull/443

Fixes #205

templates/zlogin

@@ -47,7 +47,7 @@
   done
 
   # syntax-highlighting
-  for file in ${zim_mods}/syntax-highlighting/external/highlighters/**/*.zsh; do
+  for file in ${zim_mods}/syntax-highlighting/external/highlighters/**^test-data/*.zsh; do
     zcompare ${file}
   done
   zcompare ${zim_mods}/syntax-highlighting/external/zsh-syntax-highlighting.zsh