Enable conversation colors.

Signal/src/ViewControllers/ThreadSettings/OWSConversationSettingsViewController.m

@@ -285,7 +285,6 @@ const CGFloat kIconViewLength = 24;
                                  [weakSelf showMediaGallery];
                              }]];
 
-#ifdef CONVERSATION_COLORS_ENABLED
     [mainSection addItem:[OWSTableItem
                              itemWithCustomCellBlock:^{
                                  NSString *colorName = self.thread.conversationColorName;
@@ -299,7 +298,6 @@ const CGFloat kIconViewLength = 24;
                              actionBlock:^{
                                  [weakSelf showColorPicker];
                              }]];
-#endif
 
     if ([self.thread isKindOfClass:[TSContactThread class]] && self.contactsManager.supportsContactEditing
         && !self.hasExistingContact) {

SignalServiceKit/src/TSConstants.h

@@ -17,8 +17,6 @@ typedef NS_ENUM(NSInteger, TSWhisperMessageType) {
 
 #define textSecureHTTPTimeOut 10
 
-//#define CONVERSATION_COLORS_ENABLED
-
 #define kLegalTermsUrlString @"https://signal.org/legal/"
 #define SHOW_LEGAL_TERMS_LINK