Removed useless double sort

Removed also the weird LibraryByTypeComparator comparator that is no
more used.

Author: cmaglie

app/src/cc/arduino/contributions/libraries/LibraryByTypeComparator.java

@@ -1061,7 +1061,6 @@ protected void rebuildSketchbookMenu(JMenu menu) {
 
   private LibraryList getSortedLibraries() {
     LibraryList installedLibraries = BaseNoGui.librariesIndexer.getInstalledLibraries();
-    Collections.sort(installedLibraries, new LibraryByTypeComparator());
     Collections.sort(installedLibraries, new LibraryOfSameTypeComparator());
     return installedLibraries;
   }