The `PROBE_IS_TRIGGERED_WHEN_STOWED_TEST` is able to detect if a probe is
successfully deployed/stowed.
It was part of the Allen Key probes code only.
Now the function is generally available.

Currently this test is compulsory for Allen Key probes to not alter the used behaviour
If you want to add the test for an other type of probe simply add
```
#define PROBE_IS_TRIGGERED_WHEN_STOWED_TEST
```
to your config.

Based on MarlinFirmware/MarlinDev#200 from @eboston

- `DEFAULT_LCD_CONTRAST` was incorrectly overriding all `DOGLCD`
- `MINIPANEL` conditionals are identical to `MAKRPANEL`

Sorry for not having realized someone (me) redefined not existing servo pinns to -1, some lines above.
This is a simple error - not a feature.