Small bugfix in ghci completion code

[Judah Jacobson]

Attached is a small (one-line) fix for a minor bug I found in the ghci
tab-completion code.  To reproduce this bug, in ghci type ":m GHC.Pr"
and press tab.  That line will expand to ":m GHC.PrimopWrappers"
rather than showing both  "GHC.PrimopWrappers" and "GHC.Prim" as
possibilities.

If it looks OK, can someone please apply this patch? (I think it's
good for both 6.6.1 and 6.8.)  Note that this bugfix is independent of
any work I've been doing on task #998.

Thanks,
-Judah
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