storage bucket IAM diff suppress (#3324) (#1918)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3324.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+storage: fixed an issue where `google_storage_bucket_iam_member` showed a diff for bucket self links
+```

google-beta/iam_storage_bucket.go

@@ -26,10 +26,14 @@ var StorageBucketIamSchema = map[string]*schema.Schema{
 		Type:             schema.TypeString,
 		Required:         true,
 		ForceNew:         true,
-		DiffSuppressFunc: compareSelfLinkOrResourceName,
+		DiffSuppressFunc: StorageBucketDiffSuppress,
 	},
 }
 
+func StorageBucketDiffSuppress(_, old, new string, _ *schema.ResourceData) bool {
+	return compareResourceNames("", old, new, nil)
+}
+
 type StorageBucketIamUpdater struct {
 	bucket string
 	d      *schema.ResourceData