also source ~/.profile when looking for envvars

I have the impression that setting environment variables in the custom
xinit script doesn't always work properly (no idea why). Putting them in
~/.profile seems to be more robust. Sourcing it is a good idea anyhow,
hence this patch:

scripts/core/sxmo_xinit.sh

@@ -3,6 +3,7 @@
 envvars() {
 	# shellcheck disable=SC1091
 	. /etc/profile
+	. ~/.profile
 	command -v "$TERM" || export TERM=st
 	command -v "$BROWSER" || export BROWSER=surf
 	command -v "$EDITOR" || export EDITOR=vis