Define wxUSE_TASKBARICON_BALLOONS as 1 for wxMSW builds using configure.

Defining it as 1 is better than not allowing to set it at all and this setting
is not important enough to warrant its own command-line configure option.

Closes #14106.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70943 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775