modem: fixing bug in str2mod() where MOD_APSK4 was ignored
modem: fixing bug in str2mod() where MOD_APSK4 was ignored

andrepuschmann/liquid-dsp,cjcliffe/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp,andrepuschmann/liquid-dsp,JayKickliter/liquid-dsp,cjcliffe/liquid-dsp,JayKickliter/liquid-dsp,biotrump/liquid-dsp,biotrump/liquid-dsp,andrepuschmann/liquid-dsp,cjcliffe/liquid-dsp,wangning223/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,jgaeddert/liquid-dsp,wangning223/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,manuts/liquid-dsp,manuts/liquid-dsp,biotrump/liquid-dsp,JayKickliter/liquid-dsp,manuts/liquid-dsp,JayKickliter/liquid-dsp,JayKickliter/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp,jgaeddert/liquid-dsp,andrepuschmann/liquid-dsp