Reduce minimum size of the top level frame to let it be used on 1024 x 600 displays.
Reduce minimum size of the top level frame to let it be used on 1024 x 600 displays.

git-svn-id: 567ceadc8c7dca9f342cfd1fdb923dd411579874@1228 01035d8c-6547-0410-b346-abe4f91aad63

freedv/freedv,freedv/freedv,freedv/freedv