[XAM] ProfileManager: Renamed GetProfiles to GetAccounts

This is to prevent confusion between signed-in accounts (aka. Profiles) and all entries (Accounts)

Also added GetAccount to get specific instead of all of them when not needed

src/xenia/app/emulator_window.cc

@@ -263,7 +263,7 @@ void EmulatorWindow::OnEmulatorInitialized() {
   if (!emulator_->kernel_state()
            ->xam_state()
            ->profile_manager()
-           ->GetProfilesCount()) {
+           ->GetAccountCount()) {
     new NoProfileDialog(imgui_drawer_.get(), this);
     disable_hotkeys_ = true;
   }