Fix for wrong value update after input change

[podenemus]

Removed (double) conflicting value update for the price slider. Added flag to check if price slider update came from input fields. To fix the following bug:

• Go to: https://tweakwise1-ce.emico.nl/women/new-arrivals.html
• Fill in 400 in the max value input field of the price slider
• The value of the max input field jumps back to the original value (715)
• The price filter is set to the wrong values (see url)

The removed method updated the fields with the old values and was conflicting with the value update in the input change handler here: https://github.com/EmicoEcommerce/Magento1Tweakwise/blob/master/skin/frontend/base/default/emico_tweakwise/js/AttributeSlider.js#L289
And in case of using the slider to adjust the values, the value update here: https://github.com/EmicoEcommerce/Magento1Tweakwise/blob/master/skin/frontend/base/default/emico_tweakwise/js/AttributeSlider.js#L169

Added a flag to check if update comes from input fields change, to make sure the lower and upper value are not updated double and with the old values from the onChange(values) method.