Minor fix when generating messages to send.

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -1493,7 +1493,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
         messageSend.isUDSend);
 
     // Loki: Since we don't support multi-device sending yet, just send it to the primary device
-    NSMutableArray<NSNumber *> *deviceIds = @[@(OWSDevicePrimaryDeviceId)];
+    NSMutableArray<NSNumber *> *deviceIds = [NSMutableArray arrayWithObject:@(OWSDevicePrimaryDeviceId)];
 
     /* Original code:
     NSMutableArray<NSNumber *> *deviceIds = [recipient.devices mutableCopy];