if rhs is a function, then rhs = function body

If it's a function like `vim.keymap.set("n", "", function() ui.nav_file(1) end)` we should get that function body which is `ui.nav_file(1)` and set it to rhs. The function checker is [here](https://github.com/itsmyvim/packer-imv/blob/main/lua/packer-imv/init.lua#L3-L11).

It would be like
```
local function remove_functions(table)
for k, v in pairs(table) do
if type(v) == "function" then
table[k] = THE FUNCTION BODY HERE
elseif type(v) == "table" then
remove_functions(v)
end
end
end
```