Look for correct property name.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@1361 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/launcher/Launcher.java

@@ -98,9 +98,9 @@ public class Launcher {
         }
 
         binDir = new File("").getAbsoluteFile();
-        // See if the app.dir property is set. If so, use it to find the executable.
-        if (System.getProperty("app.dir") != null) {
-            binDir = new File(System.getProperty("app.dir"));
+        // See if the appdir property is set. If so, use it to find the executable.
+        if (System.getProperty("appdir") != null) {
+            binDir = new File(System.getProperty("appdir"));
         }
 
         configFile = new File(new File(binDir.getParent(), "conf"),