qcacld-3.0: Don't delete hw_filter for NDI mode

Hardware filters are supported for STA and P2P client modes only.
It's not supported/configured for NDI mode but the
WMI_HW_DATA_FILTER_CMDID is sent to firmware with disable flag
to flush the filter. Avoid sending it for NDI vdev.

Change-Id: I34d87a4d00138386affcedecd20b7ccc90fbd05e
CRs-Fixed: 2795980