remove pickup in sccp_handle_keypad_button, references #154

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4975 43c1dc8c-776e-4df2-8ef1-6e829299be21
check for pickup extension during the extension state check, closes #154

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4976 43c1dc8c-776e-4df2-8ef1-6e829299be21