hush: add recent ash tests to hush testsuite too (they all pass for hush)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-vars/var-pattern-replacement-in-parameter-expansion-1.tests b/shell/hush_test/hush-vars/var-pattern-replacement-in-parameter-expansion-1.tests
new file mode 100755
index 0000000..e4529c6
--- /dev/null
+++ b/shell/hush_test/hush-vars/var-pattern-replacement-in-parameter-expansion-1.tests
@@ -0,0 +1,2 @@
+v="a\bc"
+echo ${v/\\b/_\\_\z_}