fix: replace underscores from macro source tags with spaces

This allows macro source tags that contain underscores and category parentheses to be processed as intended (e.g. booru tags)

src/tagstudio/qt/qt_driver.py

@@ -1222,6 +1222,7 @@ class QtDriver(DriverMixin, QObject):
                 for string in result.tag_strings:
                     if not string.strip():
                         continue
+                    string = string.replace("_", " ")
                     base_and_parent = string.split("(")
                     parent = ""
                     base = base_and_parent[0].strip(" ")