encoding/jsonpb: change MarshalOptions.Compact option to Indent

This makes it consistent with jsonpb.MarshalOptions. This does change
the default to be in compact form.

Change-Id: I1b07f06f282c019b30f3f1cbb43f6c8cba18f385
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/168405
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/protogen/protogen.go b/protogen/protogen.go
index 23bc69a..1aade1b 100644
--- a/protogen/protogen.go
+++ b/protogen/protogen.go
@@ -1110,7 +1110,7 @@
 		}
 	}
 
-	b, err := textpb.MarshalOptions{Compact: true}.Marshal(info)
+	b, err := textpb.Marshal(info)
 	if err != nil {
 		return "", err
 	}