fetchart: simplify the way the config is read

Co-authored-by: Šarūnas Nejus <[email protected]>

beetsplug/fetchart.py

@@ -1443,6 +1443,4 @@ def batch_fetch_art(self, lib, albums, force, quiet):
 
 
 def _is_source_file_removal_enabled():
-    delete_enabled = config["import"]["delete"].get(bool)
-    move_enabled = config["import"]["move"].get(bool)
-    return delete_enabled or move_enabled
+    return config["import"]["delete"] or config["import"]["move"]