Don't forcibly enable immediate XFB in game INIs

Forcing people to use hacks is a bad idea in general, and there are
two practical problems with doing it for immediate XFB in particular:

1. It breaks the GC IPL, which some users run when launching games.

2. Competitive players don't necessarily want the lowest possible
   latency - they might want the latency that's the closest to console,
   so if they're playing locally with a low-latency monitor, they might
   not want to use immediate XFB. (This isn't a theoretical concern -
   I've seen Melee players want to increase their latency.)

Besides, it feels arbitrary that just these five specific games should
have immediate XFB forced on.

Data/Sys/GameSettings/GAL.ini

@@ -19,6 +19,3 @@ EmulationIssues =
 
 [Video_Stereoscopy]
 StereoConvergence = 64
-
-[Video_Hacks]
-ImmediateXFBEnable = True

Data/Sys/GameSettings/GP5.ini

@@ -19,6 +19,3 @@ EmulationIssues =
 
 [Video_Hacks]
 EFBToTextureEnable = False
-
-[Video_Hacks]
-ImmediateXFBEnable = True

Data/Sys/GameSettings/RF7.ini

@@ -16,6 +16,3 @@ EmulationIssues =
 
 [ActionReplay]
 # Add action replay cheats here.
-
-[Video_Hacks]
-ImmediateXFBEnable = True

Data/Sys/GameSettings/RSB.ini

@@ -19,6 +19,3 @@ EmulationIssues = Classic mode score report needs real xfb. Nes masterpieces and
 
 [Video_Stereoscopy]
 StereoConvergence = 136
-
-[Video_Hacks]
-ImmediateXFBEnable = True

Data/Sys/GameSettings/STK.ini

@@ -16,6 +16,3 @@ EmulationStateId = 5
 
 [ActionReplay]
 # Add action replay cheats here.
-
-[Video_Hacks]
-ImmediateXFBEnable = True