Cache reporting support to avoid slowdown.

Turns out checking flash0:/ was not fast, oops, but especially when
disabled.

Also, make the box show as disabled when it's been disabled during the
session, and make it not do that in the menu.

UI/GameSettingsScreen.cpp

@@ -368,6 +368,7 @@ UI::EventReturn GameSettingsScreen::OnImmersiveModeChange(UI::EventParams &e) {
 UI::EventReturn GameSettingsScreen::OnRenderingMode(UI::EventParams &e) {
 	// We do not want to report when rendering mode is Framebuffer to memory - so many issues
 	// are caused by that (framebuffer copies overwriting display lists, etc).
+	Reporting::UpdateConfig();
 	enableReports_ = Reporting::IsEnabled();
 	enableReportsCheckbox_->SetEnabled(Reporting::IsSupported());
 
@@ -449,6 +450,7 @@ void GameSettingsScreen::onFinish(DialogResult result) {
 	}
 
 	Reporting::Enable(enableReports_, "report.ppsspp.org");
+	Reporting::UpdateConfig();
 	g_Config.Save();
 
 	host->UpdateUI();