GameINI: Enable Vertex Rounding for "Teenage Mutant Ninja Turtles 2: Battle Nexus"

ImmediateXFBEnable was disabled originally when enabling VertexRounding was intended

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

Data/Sys/GameSettings/GNI.ini

@@ -13,4 +13,4 @@
 # Add action replay cheats here.
 
 [Video_Hacks]
-ImmediateXFBEnable = False
+VertexRounding = True