fix(themes): Properly set theme on the hot window

- First composer window you open after changing the theme will now have
the correct theme

spec/theme-manager-spec.coffee

@@ -12,8 +12,6 @@ describe "ThemeManager", ->
   configDirPath = NylasEnv.getConfigDirPath()
 
   beforeEach ->
-    cache = NylasEnv.fileListCache()
-    cache.lessCacheImportPaths = null
     spyOn(console, "log")
     spyOn(console, "warn")
     spyOn(console, "error")

src/browser/file-list-cache.es6

@@ -6,7 +6,5 @@ export default class FileListCache {
   constructor() {
     this.imageData = "{}" // A JSON stringified hash
     this.packagePaths = []
-    this.lessCacheImportPaths = []
-    this.lessCacheImportedFiles = []
   }
 }

src/less-compile-cache.coffee

@@ -27,12 +27,9 @@ class LessCompileCache
   # and every importPath. If we already have the imports, then load it
   # from our backend FileListCache.
   setImportPaths: (importPaths=[]) ->
-    fileCache = NylasEnv.fileListCache()
-    fileCacheImportPaths = fileCache.lessCacheImportPaths ? []
     fullImportPaths = importPaths.concat(@lessSearchPaths)
-    if not _.isEqual(fullImportPaths, fileCacheImportPaths)
+    if not _.isEqual(fullImportPaths, @cache.importPaths)
       @cache.setImportPaths(fullImportPaths)
-      fileCache.lessCacheImportPaths = fullImportPaths
 
   read: (stylesheetPath) ->
     @cache.readFileSync(stylesheetPath)