Local profile default avatars should use steel background.

SignalMessaging/categories/UIColor+OWS.m

@@ -519,7 +519,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (NSString *)ows_defaultConversationColorName
 {
-    NSString *conversationColorName = @"teal";
+    NSString *conversationColorName = @"steel";
     OWSAssert([self.ows_conversationColorNames containsObject:conversationColorName]);
     return conversationColorName;
 }

SignalMessaging/utils/OWSContactAvatarBuilder.m

@@ -76,7 +76,7 @@ NS_ASSUME_NONNULL_BEGIN
     OWSAssertDebug(localNumber.length > 0);
     OWSAssertDebug(diameter > 0);
 
-    NSString *colorName = [TSThread stableConversationColorNameForString:localNumber];
+    NSString *colorName = [UIColor ows_defaultConversationColorName];
 
     return [self initWithSignalId:localNumber colorName:colorName diameter:diameter];
 }