Remove +1 stripping from numbers in modem scripts

Note prefix stripping was unreliable because any +1XX number would break things.
The advice should be to always dial with +1 / international prefixes and store
contacts in your contacts.tsv with international codes; this way we avoid any
duplicate errors since we can be assured things in mmcli always come back w/
international prefixing automatically.

scripts/modem/sxmo_modemtext.sh

@@ -22,7 +22,7 @@ editmsg() {
 
 sendmsg() {
 	MODEM="$(modem_n)"
-	NUMBER="$(echo "$1" | sed 's/^[+]//' | sed 's/^1//')"
+	NUMBER="$1"
 	TEXT="$2"
 	TEXTSIZE="${#TEXT}"