Remove unused from new sccp_config_default_value implementation

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5264 43c1dc8c-776e-4df2-8ef1-6e829299be21
Simplify new sccp_config_default_value implementation

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5265 43c1dc8c-776e-4df2-8ef1-6e829299be21