Remove all spaces from potential appUserModelID as it isn't allowed by the spec

lib/browser/init.js

@@ -93,8 +93,8 @@ if (process.platform === 'win32') {
 
   if (fs.statSyncNoException(updateDotExe)) {
     var packageDir = path.dirname(path.resolve(updateDotExe))
-    var packageName = path.basename(packageDir)
-    var exeName = path.basename(process.execPath).replace(/\.exe$/i, '')
+    var packageName = path.basename(packageDir).replace(/ /g, '')
+    var exeName = path.basename(process.execPath).replace(/\.exe$/i, '').replace(/ /g, '')
 
     app.setAppUserModelId(`com.squirrel.${packageName}.${exeName}`)
   }