Fix a bug where FIFO recording could not work.

Example (in step by step explanation):

1. Run Dolphin.

2. Go to Tools -> Fifo Player

3. Go to the Record tab and hit record and then stop without a game loaded.

The button is now disabled and will not become active again for the whole time that Dolphin is running. Dolphin must be closed and then re-opened in order to use it again. This fixes that.

I've tested it with multiple conditions to make sure this doesn't beef anything else related to the Fifo Player.

ie)

- Record then Stop without a game loaded (multiple times)
- Record then Stop with a game loaded (multiple times, as well as testing playback. All of which work fine).

Source/Core/DolphinWX/Src/FifoPlayerDlg.cpp

@@ -407,8 +407,8 @@ void FifoPlayerDlg::OnRecordStop(wxCommandEvent& WXUNUSED(event))
 		// Then stop recording
 		recorder.StopRecording();
 
-		// and disable the button to stop recording
-		m_RecordStop->Disable();
+		// and change the button label accordingly.
+		m_RecordStop->SetLabel(_("Record"));
 	}
 	else // Recorder is actually about to start recording
 	{