ui: Make swap size unlock fixed ratio

Coz it is no longer relevant

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

@@ -152,6 +152,9 @@ export const generationSlice = createSlice({
     },
     toggleSize: (state) => {
       const [width, height] = [state.width, state.height];
+      if (![null, 2 / 3, 16 / 9, 1 / 1].includes(height / width)) {
+        state.aspectRatio = null;
+      }
       state.width = height;
       state.height = width;
     },