Use ε in frame name to quickly filter window

With this change the emacs frame will be found by looking for a window
whose name contains the letter ε; since not that many windows will
have such property, I can quickly switch to emacs

emacsclient-activities

@@ -49,7 +49,7 @@ else
 
 emacsclient -s "$(emacs-session-name)" -n -e "(if (> (length (frame-list)) 1) 't)" | grep t >/dev/null;
 if [ "$?" = "1" ]; then
-    exec emacsclient -s "$(emacs-session-name)" -c --frame-parameters="(quote (name . \"main-frame on $(emacs-session-name)\"))" "$@"
+    exec emacsclient -s "$(emacs-session-name)" -c --frame-parameters="(quote (name . \"ε on $(emacs-session-name)\"))" "$@"
  else
     exec emacsclient -s "$(emacs-session-name)" "$@"
 fi