fix(core): set init_done before sourcing after directories #2027
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Summary
This PR fixes a timing issue where a plugin loaded during the after directory scan would have its own after directory skipped.
Description
This moves the init_done variable before the after directory is sourced. This fixes an issue when a plugin is sourced while the runtime path list is being looped to find all after directories. If init_done is not set, the code assumes that its own after directory will be sourced in this loop, however since it already started this is impossible.
Example Scenario
This fixes an error for me when cmp_luasnip loads, which in its after/plugin directory it calls
require("cmp"). This causes nvim-cmp and all of its dependencies to load, however none of these after directories would get sourced.