applet/digital-clock: remove negative point size
Reason for the change
The digital clock contains several instances where a negative value is assigned to point size. The code has comments that indicate this should be removed when the applet is ported to PlasmaComponents3; this was apparently forgotten then. I have not been able to find negative consequences to removing these in my testing.
This change removes these property assignments.
Test plan
Display was tested on a horizontal and vertical panel as well as in plasmoidviewer.
Screenshots or screen recordings
N/A
Bugs fixed
N/A