fixing stop tone on lines where no secondary_dialtone_tone is defined; use linedevice in indicate

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5096 43c1dc8c-776e-4df2-8ef1-6e829299be21
fixes issue with Dial softkey reported by Sharan Harkisoon

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5097 43c1dc8c-776e-4df2-8ef1-6e829299be21