re-indent Clock.c

Jim Rees requested to merge rees4905/xclock:master into master

Parts of Clock.c have become unreadable due to inconsistent style, particularly in indentation. The worst offender, clock_tic(), has 32 unique sequences of initial whitespace, most of which combine both tabs and spaces. Re-indent to xorg standards.

Signed-off-by: rees4905

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