repoquery: fix calling by_all_deps() for --tree

Fixes a bug introduced in bd00c04, where the by_all_deps() arguments
were changed to an array, but in tree_seed() it still passes a single
string.

Untested, I have actually no idea what the code does there, it looks
kind of suspect.

Closes: #1432
Approved by: j-mracek

dnf/cli/commands/repoquery.py

@@ -674,7 +674,7 @@ def tree_seed(self, query, aquery, opts, level=-1, usedpkgs=None):
                             ar[querypkg.name + "." + querypkg.arch] = querypkg
                     pkgquery = self.base.sack.query().filterm(pkg=list(ar.values()))
                 else:
-                    pkgquery = self.by_all_deps(pkg.name, None, aquery) if opts.alldeps \
+                    pkgquery = self.by_all_deps((pkg.name, ), None, aquery) if opts.alldeps \
                         else aquery.filter(requires__glob=pkg.name)
                 self.tree_seed(pkgquery, aquery, opts, level + 1, usedpkgs)