net/wget: Remove use broken use of symlinks to /usr/bin/wget

net/wget: Remove use broken use of symlinks to /usr/bin/wget

postrm/postinst symlink mangling is frowned upon
by trunk devs, in addition to packages modifying
the files as other packages during
installation/removal (without a agreed upon mechanism
for coordinating such changes) is prohibited in
most distros.

Further in this case results in wget-ssl failing to conflict
with wget-nossl.  As mentioned in the github issue
regarding this (https://github.com/openwrt/packages/issues/2728)
it is also unnessary in current openwrt/lede.

This patch there makes the symlink from the specific
flavour of wget (e.g. wget-ssl) from /usr/bin/wget part
of /install so that they conflict with each other the
way they should, and do not modify the same files
without a delibarate --force-overwrite.

Signed-off-by: Daniel Dickinson <redacted>