Adds forceLoginFallback private setting view

vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsFragment.kt

@@ -43,6 +43,9 @@ class DebugPrivateSettingsFragment : VectorBaseFragment<FragmentDebugPrivateSett
         views.forceDialPadTabDisplay.setOnCheckedChangeListener { _, isChecked ->
             viewModel.handle(DebugPrivateSettingsViewActions.SetDialPadVisibility(isChecked))
         }
+        views.forceLoginFallback.setOnCheckedChangeListener { _, isChecked ->
+            viewModel.handle(DebugPrivateSettingsViewActions.SetForceLoginFallbackEnabled(isChecked))
+        }
     }
 
     override fun invalidate() = withState(viewModel) {

vector/src/debug/res/layout/fragment_debug_private_settings.xml

@@ -25,6 +25,12 @@
                 android:layout_height="wrap_content"
                 android:text="Force DialPad tab display" />
 
+            <CheckBox
+                android:id="@+id/forceLoginFallback"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="Force login and registration fallback" />
+
         </LinearLayout>
 
     </ScrollView>