tmux: Unbind default DoubleClick bindings

When switching to the 'SecondClick' event in 4b8e877305 ("tmux: Use
SecondClick instead of DoubleClick event"), I forgot to add an `unbind`
of the default binding that was previously overwritten. Since I just
resourced my config I didn't notice.

.config/tmux/tmux.conf

@@ -28,16 +28,25 @@ bind -T copy-mode-vi MouseDragEnd1Pane {
 
 # Select word or line on double or triple click respectively (w/o aborting).
 # (These are the defaults  w/o the `run -d 0.3; send -X copy-pipe-and-cancel`)
+
+# use 'SecondClick' event instead of 'DoubleClick' for a quicker response. The
+# third click would just extend the selection further so the eager execution
+# does not hurt.
+unbind -T copy-mode-vi DoubleClick1Pane
 bind -T copy-mode-vi SecondClick1Pane {
 	select-pane -t=
 	send -X select-word
 	send -X pipe-no-clear "xclip -selection primary"
 }
+
 bind -T copy-mode-vi TripleClick1Pane {
 	select-pane -t=
 	send -X select-line
 	send -X pipe-no-clear "xclip -selection primary"
 }
+
+# use 'SecondClick' event instead of 'DoubleClick' (see above).
+unbind -n DoubleClick1Pane
 bind -n SecondClick1Pane {
 	select-pane -t=
 	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {
@@ -48,6 +57,7 @@ bind -n SecondClick1Pane {
 	}
 	send -X pipe-no-clear "xclip -selection primary"
 }
+
 bind -n TripleClick1Pane {
 	select-pane -t=
 	if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" {