XD-2539: Fix XD on Windows

JIRA: https://jira.spring.io/browse/XD-2539

`ResourcePatternScanningOptionHandlers.SingleNodeDataTransportOptionHandler.resolveMessageBusPath()`
results in a regular expression pattern containing invalid escapes (`\`) on Windows platforms.

Replace back-slashes with forward slashes.

Tested on Windows with `xd-singlenode`.