AutoMod: convert value to str to validate regex

Previously something like "combined_karma: 0" would not be able to be
validated against the regex, because the yaml parser would have made the
value into an int, and regex can only be applied to strings.

r2/r2/lib/automoderator.py

@@ -342,7 +342,7 @@ def validate(self, value):
             if value not in self.valid_values:
                 return False
         if self.valid_regex:
-            if not self.valid_regex.search(value):
+            if not self.valid_regex.search(str(value)):
                 return False
 
         return True