Some OSD elements are not drawn when GPS is disabled.

[mmosca]

Current Behavior

If GPS feature is disabled, osdIncElementIndex will short cut to OSD_ITEM_COUNT when displaying OSD_GLIDE_RANGE or OSD_NAV_WP_MULTI_MISSION_INDEX, skipping any other OSD element after those.

Affected items are:
OSD_GROUND_COURSE,
OSD_CROSS_TRACK_ERROR,
OSD_PILOT_NAME,
OSD_PAN_SERVO_CENTRED,

and any new element added in the future.

Steps to Reproduce

Add OSD_PILOT_NAME to OSD
Disable GPS feature
OSD_PILOT_NAME is not displayed in OSD.

Expected behavior

OSD_PILOT_NAME is displayed, even with GPS feature disabled.

Suggested solution(s)

Change OSD_ITEM_COUNT to OSD_PILOT_NAME in osdIncElementIndex

        if (elementIndex == OSD_GLIDE_RANGE) {
            elementIndex = feature(FEATURE_CURRENT_METER) ? OSD_CLIMB_EFFICIENCY : OSD_PILOT_NAME;
        }
        if (elementIndex == OSD_NAV_WP_MULTI_MISSION_INDEX) {
            elementIndex = OSD_PILOT_NAME;
        }

This assumes shortcutting OSD_GROUND_COURSE, OSD_CROSS_TRACK_ERROR is the desired behavior, as these elements depend on GPS.