Minor fixes.

Signal/src/ViewControllers/AppSettings/Payments/PaymentsDeactivateViewController.swift

@@ -73,7 +73,7 @@ public class PaymentsDeactivateViewController: OWSViewController {
             //
             // * The balance becomes unavailable (this should never happen).
             // * The balance becomes zero (this should be extremely rare).
-            owsFailDebug("Missing or empty balance.")
+            Logger.warn("Missing or empty balance.")
             dismiss(animated: true, completion: nil)
             return
         }

SignalMessaging/utils/DebugLogger.swift

@@ -26,7 +26,8 @@ public extension DebugLogger {
                         file: String,
                         function: String,
                         line: UInt) {
-            let message = message.description
+            // TODO: Remove.
+            let message = "MCSDK: " + message.description
             let line = Int(line)
 
             switch level {