How to enable Paint Bucket instead of Material Drop Tool on Photoshop CC 2015?

We seem to have a few posts like yours since CC2015.1.2.  The problem is, we can't tell if it is user error, and the posters are not using the fly-out tools, or if it is a fault.  I'm leaning towards the latter because I don't remember this happening before the last update.

So I Mohit's suggestion has not helpped,

Select and reset the Essentials Workspace

Click on the three dots at the bottom of the Toolbar

Click on Edit Toolbar and then on Restore defaults

If you are still in trouble, come back and we'll take it from there.