fix(ui): add default coherence mode to generation slice migration

The valid values for this parameter changed when inpainting changed to gradient denoise. The generation slice's redux migration wasn't updated, resulting in a generation error until you change the setting or reset web UI.

invokeai/frontend/web/src/features/parameters/store/generationSlice.ts

@@ -280,6 +280,7 @@ const migrateGenerationState = (state: any): GenerationState => {
     // The signature of the model has changed, so we need to reset it
     state._version = 2;
     state.model = null;
+    state.canvasCoherenceMode = initialGenerationState.canvasCoherenceMode;
   }
   return state;
 };