tests/qapi-schema: Rename returns-whitelist to returns-bad-type

This test covers returning "bad" types.  Pragma returns-whitelist is
just one aspect.  Naming it returns-whitelist is suboptimal.  Rename
to returns-bad-type.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210323094025.3569441-19-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

tests/qapi-schema/meson.build

@@ -166,9 +166,9 @@ schemas = [
   'reserved-type-list.json',
   'returns-alternate.json',
   'returns-array-bad.json',
+  'returns-bad-type.json',
   'returns-dict.json',
   'returns-unknown.json',
-  'returns-whitelist.json',
   'string-code-point-31.json',
   'string-code-point-127.json',
   'struct-base-clash-deep.json',

tests/qapi-schema/returns-bad-type.err

@@ -0,0 +1,2 @@
+returns-bad-type.json: In command 'no-way-this-will-get-whitelisted':
+returns-bad-type.json:14: command's 'returns' cannot take array type ['int']

tests/qapi-schema/returns-whitelist.err

@@ -1,2 +0,0 @@
-returns-whitelist.json: In command 'no-way-this-will-get-whitelisted':
-returns-whitelist.json:14: command's 'returns' cannot take array type ['int']