Fix White theme name mismatch for VS Code/Codium (#4858)

The White theme's vscode.json specified "White Omarchy" as the theme
name, but the Bjarne.white-theme extension registers the theme as
"White". This mismatch caused omarchy-theme-set-vscode to set
workbench.colorTheme to a non-existent theme name.

themes/white/vscode.json

@@ -1,4 +1,4 @@
 {
-  "name": "White Omarchy",
+  "name": "White",
   "extension": "Bjarne.white-theme"
 }