Fix the test suite in Release build (error injections are disabled).

test/xlog/suite.ini

@@ -4,6 +4,6 @@ description = tarantool write ahead log tests
 script = xlog.lua
 disabled =
 valgrind_disabled =
-release_disabled = errinj.test.lua, panic_on_lsn_gap.test.lua
+release_disabled = errinj.test.lua panic_on_lsn_gap.test.lua
 lua_libs =
 use_unix_sockets = True