config: Remove unused mouse binding structure

Mouse bindings are handled alongside normal bindings. Remove the unused
separate data structure definition to avoid confusion.

Signed-off-by: Michael Weiser <michael.weiser@gmx.de>

include/sway/config.h

@@ -48,7 +48,7 @@ enum binding_flags {
 };
 
 /**
- * A key binding and an associated command.
+ * A key (or mouse) binding and an associated command.
  */
 struct sway_binding {
 	enum binding_input_type type;
@@ -62,14 +62,6 @@ struct sway_binding {
 	char *command;
 };
 
-/**
- * A mouse binding and an associated command.
- */
-struct sway_mouse_binding {
-	uint32_t button;
-	char *command;
-};
-
 enum sway_switch_trigger {
 	SWAY_SWITCH_TRIGGER_OFF,
 	SWAY_SWITCH_TRIGGER_ON,