Fixes auto tempo going to infinity bug.

When auto tempo adjustment is turned on it cannot be turned off.
That is because the code only disables it when `rate` is equal to 0.
But it only executes the check when variable `speed`(== `rate`)
is DIFFERENT than 0.

res/controllers/Pioneer-DDJ-SB2-scripts.js

@@ -402,13 +402,13 @@ PioneerDDJSB2.longButtonPressWait = function() {
 PioneerDDJSB2.speedRateToNormal = function(group, deck) {
     var speed = engine.getValue(group, 'rate');
     if (speed > 0) {
-        engine.setValue(group, 'rate_perm_down_small', true);
+        engine.setValue(group, 'rate_perm_up_small', true);
         if (engine.getValue(group, 'rate') <= 0) {
             engine.stopTimer(PioneerDDJSB2.speedRateToNormalTimer[deck]);
             engine.setValue(group, 'rate', 0);
         }
     } else if (speed < 0) {
-        engine.setValue(group, 'rate_perm_up_small', true);
+        engine.setValue(group, 'rate_perm_down_small', true);
         if (engine.getValue(group, 'rate') >= 0) {
             engine.stopTimer(PioneerDDJSB2.speedRateToNormalTimer[deck]);
             engine.setValue(group, 'rate', 0);