[FIX] Xterm window title for Zsh and Bash

The escape sequence to display a title for Xterm and Termite is the
same, and the export for the current directory does not seem to have any
negative impact on Xterm.

The VTE script uses `$HOSTNAME` which is a bashism for `$HOST`, so this
needs a correction in my shell profile.

shell/.profile

@@ -45,6 +45,9 @@ if { [ -n "$BASH_VERSION" ] && shopt -q login_shell; } ||
 
     # Use my preferred pager settings for bat
     export BAT_PAGER="$PAGER $LESS"
+
+    # Fix terminal title which uses HOSTNAME instead of HOST
+    export HOSTNAME="$HOST"
 fi
 
 # Use keychain to handle ssh-agent, in interactive shell too