Labels aren't highlighted in certain colorscheme, reopening #250

[Masquue]

Reopening issue #250. Labels still are not working correctly in some colorschemes for me.

After some digging, the issue seems to stem from LeapLabel being used instead of LeapLabelPrimary when no defaults are provided by user.

The problem is in

leap.nvim/lua/leap/highlight.lua

Lines 8 to 14 in c6bfb19

	local function _2_(_, key)
	if (key == "label") then
	if pcall(api.nvim_get_hl_by_name, "LeapLabel", false) then
	return "LeapLabel"
	else
	return "LeapLabelPrimary"
	end

where the deprecated function nvim_get_hl_by_name is used.

And unfortunately it seem to have some unfixed bug related to it which would return a non empty table { [true] = 6 } when calling with some highlight group, in this case LeapLabel, resulting LeapLabel being used as match.label.

Replacing use of nvim_get_hl_by_name by nvim_get_hl would fix it for me.

And I suggest nvim_get_hl_by_name should not be used in other places as well, after all it is deprecated.