Themes - fix issue with false upgrade CTA for some free themes. (#94634)

* use themeTier instead of Wporg check for upgrade cta for community themes

* add comment

client/my-sites/theme/main.jsx

@@ -1502,7 +1502,6 @@ const ThemeSheetWithOptions = ( props ) => {
 		isPremium,
 		isThemePurchased,
 		isStandaloneJetpack,
-		isWporg,
 		demoUrl,
 		showTryAndCustomize,
 		isThemeInstalled,
@@ -1514,7 +1513,7 @@ const ThemeSheetWithOptions = ( props ) => {
 		isThemeBundleWooCommerce,
 	} = props;
 	const isThemeAllowed = useIsThemeAllowedOnSite( siteId, props.themeId );
-
+	const themeTier = useThemeTierForTheme( props.themeId );
 	let defaultOption;
 	let secondaryOption = 'tryandcustomize';
 	const needsJetpackPlanUpgrade = isStandaloneJetpack && isPremium && ! isThemePurchased;
@@ -1547,14 +1546,14 @@ const ThemeSheetWithOptions = ( props ) => {
 		! ( isSiteWooExpressFreeTrial && isThemeBundleWooCommerce )
 	) {
 		defaultOption = 'upgradePlanForBundledThemes';
-	} else if ( isWporg && ! canInstallThemes ) {
+	}
+	// isWporgTheme is true for some free themes we offer, so we need to check the tier instead.
+	else if ( themeTier === 'community' && ! canInstallThemes ) {
 		defaultOption = 'upgradePlanForDotOrgThemes';
 	} else {
 		defaultOption = 'activate';
 	}
 
-	const themeTier = useThemeTierForTheme( props.themeId );
-
 	return (
 		<ConnectedThemeSheet
 			{ ...props }