video_core,yuzu: Move UpdateRescalingInfo call to video_core

This only needs to happen once per game boot, so we can just call it
during CreateGPU and be done with it, avoiding the need to call it in
the frontends.

src/yuzu/configuration/config.cpp

@@ -850,8 +850,6 @@ void Config::ReadRendererValues() {
         ReadBasicSetting(Settings::values.disable_shader_loop_safety_checks);
     }
 
-    Settings::UpdateRescalingInfo();
-
     qt_config->endGroup();
 }
 
@@ -1409,8 +1407,6 @@ void Config::SaveRendererValues() {
         WriteBasicSetting(Settings::values.disable_shader_loop_safety_checks);
     }
 
-    Settings::UpdateRescalingInfo();
-
     qt_config->endGroup();
 }