fixed bug in toggle_touchpad

toggle_touchpad was using a static id instead of the dynamic one
readme extended

toggle_touchpad

@@ -1,6 +1,6 @@
 #!/bin/bash
 touchpad_id=$(xinput list | grep -i touch | grep -Po '(?<=id=)\d+')
-if (xinput list-props 14 | grep "Device Enabled" | grep -Po '\d$' | grep -q "1"); then
+if (xinput list-props ${touchpad_id} | grep "Device Enabled" | grep -Po '\d$' | grep -q "1"); then
   xinput disable "${touchpad_id}"
 else
   xinput enable "${touchpad_id}"