feat: Allow signature in the editor directly (#7881)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/components/widgets/WootWriter/ReplyBottomPanel.vue

@@ -288,7 +288,7 @@ export default {
       }
     },
     showMessageSignatureButton() {
-      return !this.isOnPrivateNote && this.isAnEmailChannel;
+      return !this.isOnPrivateNote;
     },
     sendWithSignature() {
       const { send_with_signature: isEnabled } = this.uiSettings;