ash: extend var_bash4.tests; nocode changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-vars/var_bash4.right

@@ -1,2 +1,4 @@
-a*b-backslashstar-
+In assignment: a*b-backslashstar-
+Unquoted: a*b-backslashstar-
+Quoted: a*b-backslashstar-
 Done: 0

shell/ash_test/ash-vars/var_bash4.tests

@@ -1,3 +1,6 @@
 FOO='a*b\*c'
-echo "${FOO//\\*/-backslashstar-}"
+BAR=${FOO//\\*/-backslashstar-}
+echo In assignment: "$BAR"
+echo Unquoted: ${FOO//\\*/-backslashstar-}
+echo Quoted: "${FOO//\\*/-backslashstar-}"
 echo Done: $?