fix: support config string shareScope (#2342)

Author: 2heal1

.changeset/tame-mirrors-greet.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/runtime': patch
+---
+
+fix: support config string shareScope

packages/runtime/src/utils/share.ts

@@ -47,7 +47,9 @@ export function formatShare(
     get,
     loaded: 'lib' in shareArgs ? true : undefined,
     version: shareArgs.version ?? '0',
-    scope: Array.isArray(shareArgs.scope) ? shareArgs.scope : ['default'],
+    scope: Array.isArray(shareArgs.scope)
+      ? shareArgs.scope
+      : [shareArgs.scope ?? 'default'],
     strategy: shareArgs.strategy || 'version-first',
   };
 }