Fixed tag removal stopping on the first encountered missing tag

Syntax of `-tagname` we rely upon here will stop execution of suggested
tags when first tag which is not present in the editor is encountered.
Just a Philomena's specific quirk, nothing more.

src/content/components/philomena/TagsForm.ts

@@ -180,7 +180,11 @@ export class TagsForm extends BaseComponent {
     }
 
     if (removedTags) {
-      tagChangeList.push(...Array.from(removedTags).map(tagName => `-${tagName}`));
+      tagChangeList.push(
+        ...Array.from(removedTags)
+          .filter(tagName => this.#tagsSet.has(tagName))
+          .map(tagName => `-${tagName}`)
+      );
     }
 
     this.#applyTagChangesWithFancyTagEditor(