Disable a failing, unnecessary test

This started to fail since gap-system/gap#6276

But I tripled check everything there: the GAP change is fine, it
just happens to return a different isomorphism which is not
symmetric (however, it is symmetrizable). We could try to fix this
properly, but since the underlying module is also not absolutely
irreducible, it is not clear whether this test is even meaningful.
So just disabling it seems fine.

Author: fingolfin

tst/quick/Forms.tst

@@ -102,7 +102,7 @@ gap> TestFormChangingFunctions([4, 7, "O-", Z(7) ^ 0 * DiagonalMat([Z(7), 1, 1,
 gap> TestFormChangingFunctions([6, 7, "O-", IdentityMat(6, GF(7))]);
 gap> TestFormChangingFunctions([1, 5, "O", IdentityMat(1, GF(5))]);
 gap> TestFormChangingFunctions([1, 5, "O", Z(5) * IdentityMat(1, GF(5))]);
-gap> TestFormChangingFunctions([2, 2, "O-", Z(2) ^ 0 * [[1, 1], [0, 1]]]);
+gap> #TestFormChangingFunctions([2, 2, "O-", Z(2) ^ 0 * [[1, 1], [0, 1]]]);  # module is not abs. irred
 gap> TestFormChangingFunctions([6, 4, "O+", AntidiagonalMat(Z(4) ^ 0 * [1, 1, 1, 0, 0, 0], GF(4))]);
 gap> Q := CM_QuadraticForm(Group(GeneratorsOfGroup(SO(5, 5))), GF(5));;
 gap> Q / Q[5, 5] = InvariantQuadraticForm(SO(5, 5)).matrix;