File Explorer: Adds node context to file explorer item

* Adds an inline context item for refresh
* Adds "change root directory"
* Adds "change SSH username"

Signed-off-by: Tyler Smalley <tyler@tailscale.com>

package.json

@@ -167,12 +167,12 @@
         },
         {
           "command": "tailscale.node.setUsername",
-          "when": "view == node-explorer-view && viewItem == peer-root",
+          "when": "(view == node-explorer-view && viewItem == peer-root) || (view == node-explorer-view && viewItem == peer-file-explorer-dir-root)",
           "group": "2_settings@3"
         },
         {
           "command": "tailscale.node.setRootDir",
-          "when": "(view == node-explorer-view && viewItem == peer-root) || (view == node-explorer-view && viewItem =~ /^peer-file-explorer-root/)",
+          "when": "(view == node-explorer-view && viewItem == peer-root) || (view == node-explorer-view && viewItem == peer-file-explorer-dir-root)",
           "group": "2_settings@3"
         },
         {
@@ -182,8 +182,8 @@
         },
         {
           "command": "tailscale.nodeExplorer.refresh",
-          "group": "inline",
-          "when": "view == node-explorer-view && viewItem =~ /^peer-file-explorer-root/"
+          "when": "(view == node-explorer-view && viewItem == peer-root) || (view == node-explorer-view && viewItem == peer-file-explorer-dir-root)",
+          "group": "inline"
         },
         {
           "command": "tailscale.node.copyIPv6",