Awesome 4 alsa widget terminal issues

[vonpupp]

Hello,

Just to report an issue. Using the volume_alsa widget specifying a terminal gives an nil error (attempt to call a nil value method set_term)

w.widgets = {
    obvious.volume_alsa():set_term("urxvt")
}

So far I can confirm: battery, keymap_switch and temp_info works fine. Would it be useful if I send you a PR with a markdown table with the modules vs. awesome versions to visually have a summary of what has been tested?

[hoelzro]

A PR would be great! As far as the method call failure goes, it looks to me like this has been broken for a while - the create function in obvious/volume_alsa.lua should probably return obj, not widget.