Normalize process.resourcesPath on load

This ensures the drive letter is consistent on Windows for when
package paths are compared to the resources path to determine
whether to use the metadata cache for a bundled package.

Closes #3932

static/index.js

@@ -5,6 +5,9 @@ window.onload = function() {
     // Skip "?loadSettings=".
     var loadSettings = JSON.parse(decodeURIComponent(location.search.substr(14)));
 
+    // Normalize to make sure drive letter case is consistent on Windows
+    process.resourcesPath = path.normalize(process.resourcesPath);
+
     var devMode = loadSettings.devMode || !loadSettings.resourcePath.startsWith(process.resourcesPath + require('path').sep);
 
     // Require before the module cache in dev mode