fix quotes

Author: JanCaha

Mergin/field_filtering.py

@@ -181,7 +181,7 @@ def _generate_sql_expression(self) -> None:
             self.filter_type in (FieldFilterType.SINGLE_SELECT, FieldFilterType.MULTI_SELECT)
             and self.field_has_multi_selection is True
         ):
-            expr = f"(',' || TRIM(\"{field}\", '{{}}') || ',' ) LIKE '%,' || {SQL_PLACEHOLDER_VALUE} || ',%'"
+            expr = f"(',' || TRIM({field}, '{{}}') || ',' ) LIKE '%,' || {SQL_PLACEHOLDER_VALUE} || ',%'"
 
         else:
             expr = ""