fix: Allow delete modal to submit when the form is clean. (#253)

Since there are no inputs it will always be clean.

src/ts/editor/ui/parts/menu/site.ts

@@ -192,7 +192,7 @@ export class SitePart extends MenuSectionPart {
           return;
         }
 
-        if (modal.selective.isClean || !modal.selective.isValid) {
+        if (!modal.selective.isValid) {
           modal.stopProcessing();
           return;
         }