Fix password type identifications

Sha1's start with sha1$, not sha1_ (and this is not a SQL LIKE match).
And fix parameters when calling re.match in the unmatched case.

pgweb/account/admin.py

@@ -80,9 +80,9 @@ class PGUserChangeForm(UserChangeForm):
             return "OAuth integrated"
         elif obj.password.startswith('pbkdf2_'):
             return "Regular password"
-        elif obj.password.startswith('sha1_'):
+        elif obj.password.startswith('sha1$'):
             return "Old SHA1 password"
-        elif re.match('^[a-z0-9]{64}'):
+        elif re.match('^[a-z0-9]{64}', obj.password):
             return "Old unknown hash"
         else:
             return "Unknown"