fix: use UNION instead of UNION ALL (#877)

Author: CyanVoxel

src/tagstudio/core/library/alchemy/library.py

@@ -96,7 +96,7 @@
 -- Note for this entire query that tag_parents.child_id is the parent id and tag_parents.parent_id is the child id due to bad naming
 WITH RECURSIVE ChildTags AS (
     SELECT :tag_id AS child_id
-    UNION ALL
+    UNION
     SELECT tp.parent_id AS child_id
 	FROM tag_parents tp
     INNER JOIN ChildTags c ON tp.child_id = c.child_id

src/tagstudio/core/library/alchemy/visitors.py

@@ -36,7 +36,7 @@
 -- Note for this entire query that tag_parents.child_id is the parent id and tag_parents.parent_id is the child id due to bad naming
 WITH RECURSIVE ChildTags AS (
     SELECT :tag_id AS child_id
-    UNION ALL
+    UNION
     SELECT tp.parent_id AS child_id
 	FROM tag_parents tp
     INNER JOIN ChildTags c ON tp.child_id = c.child_id