fix(org-drill): let-bind org-refile-targets and target real drill files

cj/drill-refile used setq, permanently replacing the session-wide org-refile-targets so every refile anywhere offered only drill targets until restart; and its (drill-dir :maxlevel . 1) entry named a bound variable, which org reads as a directory string rather than a file list, so the drill side yielded nothing. Let-bind org-refile-targets and supply (directory-files drill-dir t "\\.org$") as the file list. The stale test (which asserted the buggy drill-dir spec) is rewritten into two: file-list targets and no global clobber.

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