Make launcher executable.

Fixes issue 1301


git-svn-id: http://svn.dmdirc.com/trunk@4142 00569f92-eb28-0410-84fd-f71c24880f

src/com/dmdirc/updater/components/LauncherComponent.java

             }
 
             tmpFile.renameTo(targetFile);
+            targetFile.setExecutable(true);
             return true;
         } else {
             final ZipResourceManager ziprm = ZipResourceManager.getInstance(path);