handleCancel() {
			const oCustomFilter = this.byId("categoryFilterDialog").getFilterItems()[1];
			const oSlider = oCustomFilter.getCustomControl().getAggregation("content")[0];
			oSlider.setValue(this._iLowFilterPreviousValue).setValue2(this._iHighFilterPreviousValue);
			if (this._iLowFilterPreviousValue > oSlider.getMin() || this._iHighFilterPreviousValue !== oSlider.getMax()) {
				oCustomFilter.setFilterCount(1);
			} else {
				oCustomFilter.setFilterCount(0);
			}
		}
Sets the slider values to the previous ones
Updates the filter count