internal/pipewire: seq access method for consume

This improves readability as the offset is not immediately obvious.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/core.go

@@ -634,7 +634,7 @@ func (core *Core) consume(opcode byte, files []int, unmarshal func(v any)) error
 	case PW_CORE_EVENT_DONE:
 		var done CoreDone
 		unmarshal(&done)
-		if done.ID == roundtripSyncID && done.Sequence == CoreSyncSequenceOffset+core.ctx.sequence-1 {
+		if done.ID == roundtripSyncID && done.Sequence == CoreSyncSequenceOffset+core.ctx.currentSeq() {
 			if core.done {
 				return ErrUnexpectedDone
 			}