VolumeVerifier: Add missing assignment to summary_text.

Source/Core/DiscIO/VolumeVerifier.cpp

@@ -1432,6 +1432,7 @@ void VolumeVerifier::Finish()
       }
       else
       {
+        m_result.summary_text =
             Common::GetStringT("Problems with low severity were found. They will most "
                                "likely not prevent the game from running.");
       }