Fix underwater breathing sounds when player not fully in the water. Same as https://github.com/ValveSoftware/halflife/issues/3110.

dlls/player.cpp

@@ -1198,6 +1198,8 @@ void CBasePlayer::WaterMove()
 	}
 
 	// make bubbles
+	if( pev->waterlevel == 3 )
+	{
 		air = (int)( pev->air_finished - gpGlobals->time );
 		if( !RANDOM_LONG( 0, 0x1f ) && RANDOM_LONG( 0, AIRTIME - 1 ) >= air )
 		{
@@ -1217,6 +1219,7 @@ void CBasePlayer::WaterMove()
 					break;
 			}
 		}
+	}
 
 	if( pev->watertype == CONTENT_LAVA )		// do damage
 	{