Fix static initialization of HSL in ThemeProperties.
Fix static initialization of HSL in ThemeProperties.

Using the copy constructor for the first element in the mode-indexed
array added a static initializer and made the sizes bot unhappy.

BUG=none

Review URL: https://codereview.chromium.org/1725623003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376915}

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