Add new line after outputing extended error in atProxy
Add new line after outputing extended error in atProxy

The new line is needed in atProxy for local commands, else will
have an issue that cursor still at the end of the error string in
AT port when run a local command without a handler (handler pointer
is NULL).

Resolves: LE-15774
Change-Id: I080a63c1dc260e494f4a22bc3d9ff4ded22467f9

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af