common/test/run-param: fix parsing test.

Wasn't using valid JSON, but worked anyway.  This is actually OK
because we don't rely on tok->size, but we want to, so another fix
coming.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

common/test/run-param.c

@@ -183,7 +183,7 @@ static void tok_tok(void)
 	{
 		unsigned int n;
 		const jsmntok_t *tok = NULL;
-		struct json *j = json_parse(cmd, "{ 'satoshi', '546' }");
+		struct json *j = json_parse(cmd, "{ 'satoshi': '546' }");
 
 		assert(param(cmd, j->buffer, j->toks,
 			     p_req("satoshi", param_tok, &tok), NULL));