Bug 566637 - profiling.launch unable to load class CMainTab

- fix profiling.launch plugin.xml to fix reference to removed
  class CMainTab and replace with CMainTab2

Change-Id: I6205d9aa6bf730a1b430fb0389f4de7121d7294b
Reviewed-on: https://git.eclipse.org/r/c/linuxtools/org.eclipse.linuxtools/+/168776
Tested-by: Linux Tools Bot <linuxtools-bot@eclipse.org>
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>
(cherry picked from commit 830dddb5f9ef8c3cebd115e2b48da5b5804ac2f4)
Reviewed-on: https://git.eclipse.org/r/c/linuxtools/org.eclipse.linuxtools/+/168516
diff --git a/profiling/org.eclipse.linuxtools.profiling.launch/plugin.xml b/profiling/org.eclipse.linuxtools.profiling.launch/plugin.xml
index 974de45..1f1376a 100644
--- a/profiling/org.eclipse.linuxtools.profiling.launch/plugin.xml
+++ b/profiling/org.eclipse.linuxtools.profiling.launch/plugin.xml
@@ -456,7 +456,7 @@
             id="org.eclipse.linuxtools.profiling.launch.profileApplicationLaunch.mainTab"
             group="org.eclipse.cdt.launch.applicationProfileLaunchTabGroup"
             name="%MainTab.name"
-            class="org.eclipse.cdt.launch.ui.CMainTab">
+            class="org.eclipse.cdt.launch.ui.CMainTab2">
         <associatedDelegate delegate="org.eclipse.linuxtools.profiling.launch.profilingDelegate"/>
       </tab>
       <tab