Wrong colors when changing screen tint

[trotterdotp]

Changed screen tint to 60/60/70/70.
Using RTP tileset, a simple test project.

In RM :

In Easy RPG Player:

Another example:

[BlisterB]

Hi Trotter :), hope that other frenchies will come sooner ^^.

For those who didn't notice, in the second screen the rock near the middle of the screen becomed pink.

[Ghabry]

Thx for the report, but screen Saturation bug is already known.
Closing as a duplicate of #357