Fix typo in weblogic property key

Update Bundle.properties

Author: myatt83

contrib/j2ee.weblogic9/src/org/netbeans/modules/j2ee/weblogic9/j2ee/Bundle.properties

@@ -19,5 +19,5 @@
 
 LIBRARY_NAME=BEA WebLogic Server
 SERVER_LIBRARY_NAME=BEA WebLogic Server {0} {1}
-UNKNOWN_SEVER_LIBRARY_NAME=BEA WebLogic Server Unknown Library
+UNKNOWN_SERVER_LIBRARY_NAME=BEA WebLogic Server Unknown Library
 PLATFORM_NAME=BEA WebLogic Server J2EE Platform