Bug 1894617: ignore the root .vscode directory too; r=sheehan

It looks like I misunderstood what the original rules meant and all content of
all `.vscode` directory should be ignored, but for the `.vscode/extensions.json`
and `.vscode/tasks.json` files. Since these file are already tracked, they don't
need a dedicated ignore rules. However other files does (e.g
`.vscode/settings.json`, `.vscode/launch.json`, etc).

So we remove the exception for the root `.vscode` directory.

This is a follow up to 4952395ba0ec.

Differential Revision: https://phabricator.services.mozilla.com/D209260

.gitignore

@@ -289,9 +289,8 @@ toolchains.json
 lextab.py
 
 # Ignore Visual Studio/Visual Studio Code workspace files.
-# (but the root .vscode directory)
 .vs/
-*/.vscode/
+.vscode/
 *.user
 
 # Thunderbird source tree

.hgignore

@@ -289,9 +289,8 @@ tps_result\.json$
 ^lextab\.py$
 
 # Ignore Visual Studio/Visual Studio Code workspace files.
-# (but the root .vscode directory)
 \.vs/
-.+/\.vscode/
+\.vscode/
 \.user$
 
 # Thunderbird source tree