Fix for_window criteria and mouse button bindings

Previously, the special case handling of scratchpad and unmark commands
was (probably accidentally) limited to criteria directly handled in the
execute_command function. This would exclude: 1. for_window criteria, as
these are handled externally for views and 2. and mouse bindings which
select target the node currently under the mouse cursor.

As a concrete example `for_window [app_id="foobar"] move scratchpad,
scratchpad show` would show (or hide due to the toggling functionality)
another window from the scratchpad, instead of showing the window with
app_id "foobar".

This commit replaces the "using_criteria" flag with "node_overridden"
with the more general notion of signifying that the node (and
container/workspace) in the current command handler context of the sway
config is not defined by the currently focused node, but instead
overridden by other means, i.e., criteria or mouse position.

include/sway/config.h

@@ -559,7 +559,7 @@ struct sway_config {
 		struct sway_node *node;
 		struct sway_container *container;
 		struct sway_workspace *workspace;
-		bool using_criteria;
+		bool node_overridden; // True if the node is selected by means other than focus
 		struct {
 			int argc;
 			char **argv;