fixed #6382
fixed #6382

slider unit test added.
tests;
+disable
+animate
+orientation
+range
+min max
+onChange

primefaces/primeng,WebRota/primeng,311devs/primeng,sourabh8003/ultimate-primeNg,aaraggornn/primeng,WebRota/primeng,primefaces/primeng,aaraggornn/primeng,WebRota/primeng,carlosearaujo/primeng,sourabh8003/ultimate-primeNg,primefaces/primeng,carlosearaujo/primeng,311devs/primeng,311devs/primeng,311devs/primeng,sourabh8003/ultimate-primeNg,carlosearaujo/primeng,carlosearaujo/primeng,aaraggornn/primeng,primefaces/primeng,aaraggornn/primeng,WebRota/primeng,sourabh8003/ultimate-primeNg