Revert "nit"

This reverts commit e22f03a0e9.

src/scripts/app.ts

@@ -636,10 +636,12 @@ export class ComfyApp {
         this.editor_alpha = 0.4
       }
 
-      let bgColor = old_bgcolor
+      let bgColor: string | undefined
       if (node.mode === LGraphEventMode.BYPASS) {
         bgColor = app.bypassBgColor
         this.editor_alpha = 0.2
+      } else {
+        bgColor = old_bgcolor
       }
 
       const adjustments: ColorAdjustOptions = {}