Default set to 50° for Paint-on Supports > Highlight overhang by angle

Is your feature request related to a problem? Please describe. Whenever I open the Paint-On Support tool, the default "Highlight overhang by angle:" is set to 0°. This is almost never a useful default, and I must manually set an appropriate angle to start visualizing and painting-on supports. Dragging the slider to a specific value (e.g. 50°) requires a very stead hand (getting within a few degrees is easier).

Describe the solution you'd like The default for this value should be set to something more useful. I recommend 50°, as that is the default setting for placing automatic supports on models. If the user wants to see the 0° setting, dragging the slider all the way to 0° is very easy (easier than trying to carefully pick 50°). Overall, this would commonly save unnecessary steps.

Describe how it would work When the Paint-On Support tool is opened, the "Highlight overhang by angle:" setting would be pre-set to 50°.

Describe alternatives you've considered There are some alternatives that would still be easier than having to drag the slider to 50° each time:

1. A tiny button shaped like an arrow, pointing to the 50° setting, similar to the slider button used to drag the view through layers of a sliced model. Clicking it would instantly set it to 50°.
2. PrusaSlicer could remember the last setting used. Since it's almost always 50° (for me), it would basically stay at that all the time.
3. When dragging the slider, it could have a behavior similar to the Rotate tool, where dragging from below the bar moves in 10° tick-mark increments, but dragging above the bar moves in 1° increments.
4. There could be +/- buttons that move the current setting value up/down by 10° increments.
5. The slider could be larger, allowing more accurate dragging to easily hit 50°.
6. The setting could default to whatever the current Print Settings > Support Material > "Overhang threshold:" setting is. (Though this is usually set to the recommended setting of 0° for "automatic detection".

Additional context Add any other context or paint drawing about the feature request here.