Make the pickers for Dyntopo/Remesh density work the same way as Sample Color

Right now if you keybind the pickers that sample Dyntopo or Remesh density, you have to (after pressing the keybinding) perform an extra click in the spot on the mesh where you want to sample.

The Sample Color operator just automatically samples the mesh that is under the cursor when the keybinding was pressed.

I think the Sample Color behavior is much better.

Additionally the Dyntopo/Remesh pickers, when activated with a key, don't have the eyedropper cursor that they have when activated via UI button. They just freeze the sculpt cursor until that extra click is performed.