Prefer files when handling paste event

ts/quill/signal-clipboard/index.ts

@@ -56,11 +56,14 @@ export class SignalClipboard {
     const signal = event.clipboardData.getData('text/signal');
 
     const clipboardContainsFiles = event.clipboardData.files?.length > 0;
-    if (!clipboardContainsFiles) {
+
-      event.preventDefault();
+    if (clipboardContainsFiles) {
-      event.stopPropagation();
+      return;
     }
 
+    event.preventDefault();
+    event.stopPropagation();
+
     if (selection == null) {
       return;
     }