geos: fix package test script name

pkgs/development/libraries/geos/tests.nix

···
 let
   inherit (geos) pname;
 in
-runCommand "${geos}-tests" { meta.timeout = 60; }
+runCommand "${pname}-tests" { meta.timeout = 60; }
   ''
     ${geos}/bin/geosop \
       --explode \