x11/wapanel: temporarily drop subpackages

https://github.com/freebsd/poudriere/issues/1113
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276845

Requested by: makc (kde), bdrewery (pkgmgr)
Suggested by: pizzamig (portmgr)

This reverts commit 4b4539c77959a64fc0f59e46b1112d4f76557ac2.