No changes, just update the file name in the header.

Update the name in the header to match the actual file name.

See #12904.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76955 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775