nix: use the correct self attribute in the module import #75

Job	Run time
Build Exposed Packages (anyrun)	5m 13s
Build Exposed Packages (applications)	2m 51s
Build Exposed Packages (dictionary)	3m 39s
Build Exposed Packages (kidex)	2m 45s
Build Exposed Packages (randr)	2m 23s
Build Exposed Packages (rink)	3m 9s
Build Exposed Packages (shell)	1m 38s
Build Exposed Packages (stdin)	1m 50s
Build Exposed Packages (symbols)	3m 19s
Build Exposed Packages (websearch)	3m 8s
	29m 55s

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