GameINI: Enable Vertex Rounding for "Teenage Mutant Ninja Turtles 3: Mutant Nightmare"

ImmediateXFBEnable was disabled originally when enabling VertexRounding was intended

https://bugs.dolphin-emu.org/issues/10186

Data/Sys/GameSettings/G3Q.ini

@@ -13,7 +13,7 @@
 # Add action replay cheats here.
 
 [Video_Hacks]
-ImmediateXFBEnable = False
+VertexRounding = True
 
 [Video_Settings]
 SafeTextureCacheColorSamples = 512