dep-resolv: Fix Perl warning about non-numeric comparison.
When sorting back edges for dependency 'votes' in the new dependency resolver, dfaure encountered Perl warnings to the effect of: > Argument "5/8" isn't numeric in numeric comparison (<=>) at > /kdesrc-build/modules/ksb/DependencyResolver.pm line 776. This turns out to be because converting an entire hash object into a scalar value doesn't just return the number of key/value pairs, but instead returns a string describing metadata about the hash object's content (see https://perlmaven.com/perl-hash-in-scalar-and-list-context) While this doesn't actually break sorting due to the way Perl constructs the string, it does cause warnings about using numeric comparisons on strings. Fix by applying `scalar` to just the list of keys in the hash containing votes, which is just a way to determine the number of keys in the hash.
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