Update recommended GN extension

This extension is much more powerful as it provides more useful
information.

Bug: none
Change-Id: If7f81a0da236418225ef3f93acce347161ea65c3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6404754
Commit-Queue: Benedikt Meurer <[email protected]>
Reviewed-by: Benedikt Meurer <[email protected]>
Auto-Submit: Nikolay Vitkov <[email protected]>

Author: Lightning00Blade

.vscode/extensions.json

@@ -1,7 +1,3 @@
 {
-  "recommendations": [
-    "dbaeumer.vscode-eslint",
-    "runem.lit-plugin",
-    "npclaudiu.vscode-gn"
-  ]
+  "recommendations": ["dbaeumer.vscode-eslint", "runem.lit-plugin", "Google.gn"]
 }