Fix error when pressed back during live creation window that display the end of the stream that never exist

app/src/main/java/fr/mobdev/peertubelive/activity/CreateLiveActivity.kt

@@ -364,10 +364,10 @@ class CreateLiveActivity : AppCompatActivity() {
         }
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        setResult(resultCode)
+    override fun onBackPressed() {
+        setResult(-1)
         finish()
+        super.onBackPressed()
     }
 
 }