PluginWrapper.getLongName() was using the wrong property name to get the plugin

long name from the manifest file. Change "Long-PluginName" to "Long-Name" to
match manifest contents.



git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@13658 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginWrapper.java

@@ -210,7 +210,7 @@ public final class PluginWrapper {
      * Returns a one-line descriptive name of this plugin.
      */
     public String getLongName() {
-        String name = manifest.getMainAttributes().getValue("Long-PluginName");
+        String name = manifest.getMainAttributes().getValue("Long-Name");
         if(name!=null)      return name;
         return shortName;
     }