ipc: remove extraneous values

Removes IPC_EVENT_MODIFIER and IPC_EVENT_INPUT, which were sway-specific and unused

include/ipc.h

@@ -30,8 +30,6 @@ enum ipc_command_type {
 	IPC_EVENT_BINDING = ((1<<31) | 5),
 	IPC_EVENT_SHUTDOWN = ((1<<31) | 6),
 	IPC_EVENT_TICK = ((1<<31) | 7),
-	IPC_EVENT_MODIFIER = ((1<<31) | 16),
-	IPC_EVENT_INPUT = ((1<<31) | 17),
 };
 
 #endif

sway/ipc-server.c

@@ -664,8 +664,6 @@ void ipc_client_handle_command(struct ipc_client *client) {
 				client->subscribed_events |= event_mask(IPC_EVENT_SHUTDOWN);
 			} else if (strcmp(event_type, "window") == 0) {
 				client->subscribed_events |= event_mask(IPC_EVENT_WINDOW);
-			} else if (strcmp(event_type, "modifier") == 0) {
-				client->subscribed_events |= event_mask(IPC_EVENT_MODIFIER);
 			} else if (strcmp(event_type, "binding") == 0) {
 				client->subscribed_events |= event_mask(IPC_EVENT_BINDING);
 			} else if (strcmp(event_type, "tick") == 0) {