feat(files_sharing): Hide external shares for users in excluded groups

- Added frontend check to hide link shares if, public sharing is disabled.

Signed-off-by: nfebe <fenn25.fn@gmail.com>

[skip ci]

apps/files_sharing/src/views/SharingTab.vue

@@ -148,7 +148,24 @@ export default {
 		 * @return {boolean}
 		 */
 		isSharedWithMe() {
-			return Object.keys(this.sharedWithMe).length > 0
+			return this.sharedWithMe !== null
+				&& this.sharedWithMe !== undefined
+		},
+
+		/**
+		 * Is link sharing allowed for the current user?
+		 *
+		 * @return {boolean}
+		 */
+		isLinkSharingAllowed() {
+			const currentUser = getCurrentUser()
+			if (!currentUser) {
+				return false
+			}
+
+			const capabilities = getCapabilities()
+			const publicSharing = capabilities.files_sharing?.public || {}
+			return publicSharing.enabled === true
 		},
 
 		canReshare() {