Partial revert of 5102880f51. That commit decreased pen tablet drag
threshold as pressure is added. Unfortunately, although this allowed a
quicker response to start of drag, this also increased the difficultly
of initiating a press when both actions are available. With numerical
inputs for example, although dragging is more responsive clicking into
the input to edit was more difficult.
Pull Request: https://projects.blender.org/blender/blender/pulls/140066