path: path.normalize no longer lower-cases drive letters

Fixes an omission in e24fa83.

lib/path.js

@@ -175,11 +175,6 @@ win32.normalize = function(path) {
       tail = result[3],
       trailingSlash = /[\\\/]$/.test(tail);
 
-  // If device is a drive letter, we'll normalize to lower case.
-  if (device && device.charAt(1) === ':') {
-    device = device[0].toLowerCase() + device.substr(1);
-  }
-
   // Normalize the tail path
   tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {
     return !!p;