Fix W391 linter issues (#35109)

Fixes a couple of W391 linter issues that were introduced by merging a
couple of trac tickets.

src/sage/combinat/key_polynomial.py

@@ -863,4 +863,3 @@ def sorting_word(alpha):
                 w.append(j+1)
                 L[j], L[j + 1] = L[j + 1], L[j]
     return reversed(w), L
-

src/sage/combinat/schubert_polynomial.py

@@ -499,4 +499,3 @@ def product_on_basis(self, left, right):
             X[4, 2, 1, 3]
         """
         return symmetrica.mult_schubert_schubert(left, right)
-

src/sage/groups/cactus_group.py

@@ -997,4 +997,3 @@ def gens(self):
                     continue
                 gens.append(val)
         return tuple([self(g) for g in gens])
-

src/sage/groups/finitely_presented_named.py

@@ -595,4 +595,3 @@ def CactusPresentation(n):
             elt = gens[i] * gens[j] * ~gens[K.index(y)] * ~gens[K.index(x)]
             rls.append(elt)
     return FinitelyPresentedGroup(F, tuple(rls))
-

src/sage/groups/kernel_subgroup.py

@@ -223,4 +223,3 @@ def __invert__(self):
                 s[1,2]*s[2,3]*s[1,2]*s[1,3]
             """
             return type(self)(self.parent(), ~self.value)
-

src/sage/groups/misc_gps/misc_groups_catalog.py

@@ -25,4 +25,3 @@
 from sage.combinat.root_system.reflection_group_real import ReflectionGroup
 from sage.groups.cactus_group import CactusGroup as Cactus
 from sage.groups.cactus_group import PureCactusGroup as PureCactus
-