fix: custom contextual variabels when superadmin (#3458)

frontend/src/routes/(root)/(logged)/variables/+page.svelte

@@ -133,7 +133,7 @@
 		documentationLink="https://www.windmill.dev/docs/core_concepts/variables_and_secrets"
 	>
 		<div class="flex flex-row justify-end">
-			{#if tab == 'contextual' && $userStore?.is_admin}
+			{#if tab == 'contextual' && ($userStore?.is_admin || $userStore?.is_super_admin)}
 				<Button
 					size="md"
 					startIcon={{ icon: Plus }}
@@ -408,7 +408,7 @@
 						headers={['Name', 'Value']}
 						data={contextualVariables.filter((x) => x.is_custom)}
 						keys={['name', 'value']}
-						getRowActions={$userStore?.is_admin
+						getRowActions={$userStore?.is_admin || $userStore?.is_super_admin
 							? (row) => {
 									return [
 										{