Unable to push files to Windows 7

Windows 7 says it can handle the maximum OBEX packet size. However
if the maximum packet size is used the transfer will fail. This
should be fixed by Microsoft but until they do the only way to solve
this is to reduce the maximum packet size for the OBEX client.

Change-Id: I51975eec972395ae3f1f21cca236b223d0812ef3