UNC host allow list should be case insensitive (fix microsoft#182277) (microsoft#182757)

* UNC host allow list should be case insensitive (fix microsoft#182277)

* only use `toLowerCase()`

Author: bpasero

src/vs/base/node/unc.js

@@ -62,10 +62,10 @@
 			const allowlist = processUNCHostAllowlist();
 			if (allowlist) {
 				if (typeof allowedHost === 'string') {
-					allowlist.add(allowedHost);
+					allowlist.add(allowedHost.toLowerCase()); // UNC hosts are case-insensitive
 				} else {
 					for (const host of toSafeStringArray(allowedHost)) {
-						allowlist.add(host);
+						addUNCHostToAllowlist(host);
 					}
 				}
 			}