Fix up KDE 'plasma-disks' test stuff

In #235 we accidentally included an entire disks.pm test that
wasn't meant to be there - the infocenter module test is the
right thing to exercise plasma-disks, there is no standalone
app, running 'disks' just gets you the KDE Partition Manager,
which we already test. So this removes that test and renames a
needle that looks like it's for that test but is actually for
the kinfocenter module, to make this clearer.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/kde/apps/infocenter_smart_status_shown.json

@@ -1,7 +1,7 @@
 {
   "properties": [],
   "tags": [
-    "disks_runs"
+    "infocenter_smart_status_shown"
   ],
   "area": [
     {

tests/apps_startstop/kde/disks.pm

@@ -1,26 +0,0 @@
-use base "installedtest";
-use strict;
-use testapi;
-use utils;
-
-# This test checks that Disks starts.
-
-sub run {
-    my $self = shift;
-    
-    # Start the application
-    menu_launch_type 'disks';
-    # Check that it is started
-    assert_screen 'disks_runs';
-    # Close the application
-    quit_with_shortcut();
-}
-
-sub test_flags {
-    return {always_rollback => 1};
-}
-
-
-1;
-
-# vim: set sw=4 et:

tests/apps_startstop/kde/infocenter.pm

@@ -19,7 +19,7 @@ sub run {
     # If the disks module is present, open it
     assert_and_click "infocenter_smart_status";
     # Check that a correct screen is displayed.
-    assert_screen "disks_runs";
+    assert_screen "infocenter_smart_status_shown";
     # Close the application
     quit_with_shortcut();
 }