Bring back green color to completed upgrades

dark theme fix

src/css/ingame_hud/shop.scss

@@ -241,6 +241,10 @@
 
                             &.complete {
                                 background-color: $colorGreenBright;
+                                
+                                @include DarkThemeOverride {
+                                    background-color: $colorGreenBright;
+                                }
                             }
                         }
                     }