test-glog: Remove sed hack - '...$HGTMP...' isn't expanded anyway

tests/test-glog

@@ -170,6 +170,6 b' echo % incoming and outgoing'
 cd ..
 hg clone -U -r31 repo repo2
 cd repo2
-hg incoming -q --graph | sed -e 's|$HGTMP|[HGTMP]|'
+hg incoming -q --graph
 cd ..
 hg -R repo outgoing --graph repo2