More user-friendly defaults for DisplayMode and DisplayDimmer (#19138)

Changing default for DisplayMode from 1 to 0. Users are getting confused by the display doing something they did not ask for (and not being aware of DisplayMode). This got worse with LVGL/HASPmota displays becoming common, with users having much less reason to dive into the old DisplayXxxxx commands. And it may even be hard to see that it is even a display of time/date causing the display to flicker.

Changing default for DisplayDimmer from 10% to 50%. The low brightness of 10% is not always easy to see, especially in daylight. 50% is generally better, while not going "full blast" with 100%.

tasmota/tasmota_support/settings.ino

@@ -1289,12 +1289,12 @@ void SettingsDefaultSet2(void) {
 
  // Display
 // Settings->display_model = 0;
- Settings->display_mode = 1;
+ Settings->display_mode = 0;
  Settings->display_refresh = 2;
  Settings->display_rows = 2;
  Settings->display_cols[0] = 16;
  Settings->display_cols[1] = 8;
- Settings->display_dimmer_protected = -10; // 10%
+ Settings->display_dimmer_protected = -50; // 50%
  Settings->display_size = 1;
  Settings->display_font = 1;
 // Settings->display_rotate = 0;