snort3: require new libdaq3 package

Snort 3.0.3-1 requires libdaq 3.0.0-beta1, but this version is no longer
compatible with Snort 2. Thus OpenWrt now provides both a libdaq and
libdaq3 package. This modifies the snort3 package to require the latter.

Signed-off-by: W. Michael Petullo <mike@flyn.org>