feature flag for group avatar color

SignalMessaging/categories/UIColor+OWS.m

@@ -198,6 +198,7 @@ NS_ASSUME_NONNULL_BEGIN
 // TODO: Remove
 + (UIColor *)ows_darkSkyBlueColor
 {
+    // HEX 0xc2090EA
     return [UIColor colorWithRed:32.f / 255.f green:144.f / 255.f blue:234.f / 255.f alpha:1.f];
 }
 

SignalMessaging/utils/OWSGroupAvatarBuilder.m

@@ -66,8 +66,12 @@ NS_ASSUME_NONNULL_BEGIN
         return cachedAvatar;
     }
 
+#ifdef SHOW_COLOR_PICKER
     UIColor *backgroundColor =
         [OWSConversationColor conversationColorOrDefaultForColorName:conversationColorName].themeColor;
+#else
+    UIColor *backgroundColor = UIColor.ows_darkSkyBlueColor;
+#endif
     UIImage *_Nullable image =
         [OWSGroupAvatarBuilder groupAvatarImageWithBackgroundColor:backgroundColor diameter:diameter];
     if (!image) {