make tag updates wipe non-included tags

Updated via bruno"
Updated via bruno",

bruno/CodeSnippets/edit_snippet.bru

@@ -17,6 +17,7 @@ params:query {
 body:json {
   {
     "title": "Mock snippet sent via Bruno with updated title",
-    "markdown": "## MOCK SNIPPET\nUpdated via bruno"
+    "markdown": "## MOCK SNIPPET\nUpdated via bruno",
+    "tags": ["mock", "updated"]
   }
 }