Fix indentation & add proto lint extension

.vscode/extensions.json

@@ -1,3 +1,3 @@
 {
-  "recommendations": ["zxh404.vscode-proto3"]
+  "recommendations": ["zxh404.vscode-proto3", "plex.vscode-protolint"]
 }

mesh.proto

@@ -723,7 +723,7 @@ message Data {
    * Defaults to false. If true, then what is in the payload should be treated as an emoji like giving
    * a message a heart or poop emoji.
    */
-   uint32 group_id = 9;
+  uint32 group_id = 9;
 }
 
 /*