Add missing formatting directive

Fixes the error
```
fmt.Errorf call has arguments but no formatting directives
```

Test: go test ./android
Change-Id: Ic589d6133ccdc88e77dedd4b8a5a56166f62efa9

android/bazel.go

@@ -255,7 +255,7 @@ func (b *BazelModuleBase) GetBazelLabel(ctx BazelConversionPathContext, module b
 	if b.ShouldConvertWithBp2build(ctx) {
 		return bp2buildModuleLabel(ctx, module)
 	}
-	panic(fmt.Errorf("requested non-existent label for module ", module.Name()))
+	panic(fmt.Errorf("requested non-existent label for module %s", module.Name()))
 }
 
 type Bp2BuildConversionAllowlist struct {