GameSettings: improve We Cheer and We Cheer 2 default settings

Also use lowercase 'ini' file extension.

Data/Sys/GameSettings/R6C.ini

@@ -12,4 +12,6 @@
 [Video_Enhancements]
 
 [Video_Hacks]
-DeferEFBCopies = False
+# Both settings are required to avoid black faces and text issues with the on-screen keyboard.
+EFBToTextureEnable = False
+DeferEFBCopies = False

Data/Sys/GameSettings/RCH.ini

@@ -13,4 +13,5 @@
 # Add graphics enhancements here.
 
 [Video_Hacks]
-DeferEFBCopies = False
+# Required to avoid washed out rendering.
+EFBToTextureEnable = False