snort3: fix typo preventing vectorscan detection

snort3: fix typo preventing vectorscan detection

Since vectorscan-runtime was dropped in the following commit, need to
replace references to it with just vectorscan in order to compile
snort3 against it: https://github.com/openwrt/packages/commit/8a3c7a69e649a9a5cbb0a642a661dd480b8583ff

Without this change, even having CONFIG_PACKAGE_vectorscan=y in the
.config will result in a failure to compile against it, e.g:

...
Feature options:
    DAQ Modules:    Dynamic
    libatomic:      User-specified
    Hyperscan:      OFF
...

Signed-off-by: John Audia <[email protected]>