Fix subscribe grep filter

Sometimes, only the client event is present, to be safe, update when
it's triggered.

Author: Aerion

pulseaudio-control.bash

@@ -338,9 +338,15 @@ function listen() {
     # an event occurs.
     output
 
+    if [[ "$NODE_TYPE" == "output" ]]; then
+        events_regex="on \(card\|sink\|server\|client\)"
+    else
+        events_regex="on \(card\|source\|server\|client\)"
+    fi
+
     # Listen for changes and immediately create new output for the bar.
     # This is faster than having the script on an interval.
-    pactl subscribe 2>/dev/null | grep --line-buffered -e "on card" -e "on s${SINK_OR_SOURCE}" -e "on server" | {
+    pactl subscribe 2>/dev/null | grep --line-buffered -e "$events_regex" | {
         while read -r; do
             # Output the new state
             output