ext/lame/gstlame.*: Get the defaults settings of LAME in the plugin initialization...

ext/lame/gstlame.*: Get the defaults settings of LAME in the plugin initialization function and return FALSE here if ...

Original commit message from CVS:
* ext/lame/gstlame.c: (gst_lame_class_init), (gst_lame_init),
(gst_lame_chain), (gst_lame_get_default_settings), (plugin_init):
* ext/lame/gstlame.h:
Get the defaults settings of LAME in the plugin initialization
function and return FALSE here if something goes wrong. This removes
the hacky failing instance init function.
Use LAMEs default value for all settings instead of overwriting some
of them. Overwriting some of them gives unexpected results if one only
sets a preset. Fixes bug #498004.