output/Thread: skip WaitForDelay() after resuming playback

This allows removing the "base.pause" check from the JACK output
plugin, and will allow removing similar accesses from other plugins.

src/output/plugins/JackOutputPlugin.cxx

@@ -129,7 +129,7 @@ struct JackOutput {
 	size_t WriteSamples(const float *src, size_t n_frames);
 
 	std::chrono::steady_clock::duration Delay() const noexcept {
-		return base.pause && pause && !shutdown
+		return pause && !shutdown
 			? std::chrono::seconds(1)
 			: std::chrono::steady_clock::duration::zero();
 	}