Create fonts before sourcing theme scripts

[rugudu]

Move the font create block above the source statements in sv.tcl. This reorders initialization to ensure proper named font binding.

[rugudu]

In my case, a corresponding issue surfaced with the Treeview style, which uses the linespace of SunValleyBodyFont to determine rowheight and is unable to do so with the current ordering. I had not noticed this previously; the issue appeared when using libtk 9.0, which is relatively recent.

Since creating the fonts before sourcing the scripts is the correct order IMHO, and the fix appears to be pretty low risk, I did not verify the behavior with older Tk versions.

[deajan]

@rugudu The same happens to me, Treeview has a different linespace depending on dark/light theme.
Reordering font inclusion seems to fix part of the problem, but not all.