Revert "improve efficiency of _glob_to_re"

This reverts commit edac710bc0.

synapse/push/push_rule_evaluator.py

@@ -230,8 +230,7 @@ def _glob_to_re(glob: str, word_boundary: bool) -> Pattern:
     if IS_GLOB.search(glob):
         r = re.escape(glob)
 
-        # replace 1 or more repeats of `\*` with `.*?`
-        r = re.sub(r"(\\\*)+", ".*?", r)
+        r = r.replace(r"\*", ".*?")
         r = r.replace(r"\?", ".")
 
         # handle [abc], [a-z] and [!a-z] style ranges.