KitManager: Use static API as other singletons do

Change-Id: Ia49c6552a5aae72870687ef9c64f2642fbe24155
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/projectexplorer/project.cpp

@@ -270,7 +270,7 @@ Target *Project::restoreTarget(const QVariantMap &data)
         return 0;
     }
 
-    Kit *k = KitManager::instance()->find(id);
+    Kit *k = KitManager::find(id);
     if (!k) {
         qWarning("Warning: No kit '%s' found. Continuing.", qPrintable(id.toString()));
         return 0;