Core: Convert logging over to fmt pt.4

Continues the migration of logging in the Core library. This part
finishes up the remaining log calls within the IOS code.

Source/Core/Core/IOS/ES/Identity.cpp

@@ -181,7 +181,7 @@ ReturnCode ES::VerifySign(const std::vector<u8>& hash, const std::vector<u8>& ec
     return ret;
   }
 
-  INFO_LOG(IOS_ES, "VerifySign: all checks passed");
+  INFO_LOG_FMT(IOS_ES, "VerifySign: all checks passed");
   return IPC_SUCCESS;
 }