style(shortcuts): gofmt binder_test.go

CI fast-gate's `gofmt -l .` flagged an alignment issue in contentBucket:
gofmt aligns struct field tags to the longest *named* tag-bearing field
in the group; my hand-written extra spaces in `Text *string   \`flag:"ct"\``
got normalised to a single space.

Behaviour-neutral; tests still pass.

shortcuts/common/binder_test.go

@@ -240,7 +240,7 @@ type vidGroup struct {
 	Cover string `flag:"vid-cover"`
 }
 type contentBucket struct {
-	Text  *string   `flag:"ct"`
+	Text  *string `flag:"ct"`
 	Video *vidGroup
 }