Apply color mask when alpha test parameters change. Required to make the changes in revision be706a397720 work properly.

Fixes issue 6080.
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).
Display the initial number of frames that are to be recorded in the Fifo Player.

Before this commit, nothing would would be displayed in the "Frames to Record" text control.

This fixes that by setting it to what m_FramesToRecord is initially set to, which is 1 (at the time of this commit).