anvil.shell: don't send first configure to WlShell
anvil.shell: don't send first configure to WlShell

It doesn't need it, and it also takes the (0, 0) size literally, which
makes everything try to be the smallest size possible initially.

Smithay/smithay,Smithay/smithay,vberger/smithay,vberger/smithay,Smithay/smithay,Smithay/smithay