cleanup: remove setting samplerate with Sonic.

we currently only support 22050 as samplerate so this code has no
effect. This should be readded to setSpeed() with and without Sonic if
multiple samplerates are supported in the future.

src/libespeak-ng/setlengths.c

 			speed.min_sample_len = 420 - (wpm - 440);
 	}
 
-#if HAVE_SONIC_H
-	// adjust for different sample rates
-	speed.min_sample_len = (speed.min_sample_len * samplerate_native) / 22050;
-#endif
-
 	speed.pause_factor = (256 * s1)/115; // full speed adjustment, used for pause length
 	speed.clause_pause_factor = 0;