Keymaps: Helix rgblight mode update (#4091)

Keymaps: Helix rgblight mode update (#4091)

* Helix each keymap's using rgblight mode symbol instead magic number

No change in build result.

* Helix pico keymaps: make rgblight modes selectable.

No change in build result.

* Helix rev2 keymaps: make rgblight modes selectable.

No change in build result.

* fixed Helix froggy/keymap.c: invalid rgblight mode value 0 to 1 (=RGBLIGHT_MODE_STATIC_LIGHT)

* Deselect RGB_TEST and ALTERNATING in Helix rev2,pico keymaps config.h.