Update random matrix Core test for new random(QQ) behavior

M2/Macaulay2/tests/normal/randommat.m2

@@ -17,8 +17,7 @@ assert( f == matrix {{47*x-16*y, 21*x-42*y}, {-17*x-23*y, 16*x-34*y}})
 S = QQ[x,y]/(x^2,y^2)
 g = random(S^{2:0},S^{2:-1})
 toString g
-assert( g == matrix {{10/3*x+7/4*y, 6/7*x+9/8*y}, {5/6*x+8*y, 3/4*x+8/7*y}})
--- old version: assert( g == matrix {{x+5/6*y, 3/7*x+4/5*y}, {8*x+2/5*y, 3/4*x+1/6*y}} )
+assert( g == matrix {{3/5*x+5/6*y, 2/5*x+3/8*y}, {3/8*x+5/6*y, 4/7*x}})
 
 -- check random isomorphisms are isomorphisms