PGXP: Make preserving pre-divide fractional coordinates an option

Fixes holes in geometry in Crash Team Racing with PGXP on.

src/core/host_interface.cpp

@@ -434,6 +434,7 @@ void HostInterface::SetDefaultSettings(SettingsInterface& si)
   si.SetBoolValue("GPU", "PGXPTextureCorrection", true);
   si.SetBoolValue("GPU", "PGXPVertexCache", false);
   si.SetBoolValue("GPU", "PGXPCPU", false);
+  si.SetBoolValue("GPU", "PGXPPreserveProjFP", false);
 
   si.SetStringValue("Display", "CropMode", Settings::GetDisplayCropModeName(Settings::DEFAULT_DISPLAY_CROP_MODE));
   si.SetIntValue("Display", "ActiveStartOffset", 0);