Add termux workaround to xterm workaround

.config/zsh/keys.zsh

@@ -63,7 +63,8 @@ if [[ "${TERM}" =~ "^rxvt" ]]; then
     bindkey '^[Ob'    history-substring-search-down
 fi
 
-if [[ "${TERM}" =~ "^xterm" ]]; then
+# termux claims it is xterm <https://github.com/termux/termux-app/issues/2744>
+if [[ ${TERM} == xterm* && ! -v TERMUX_APP_PID ]]; then
     bindkey '^H'      backward-delete-char
     bindkey '^?'      backward-delete-word
 fi