Invalid "symbolIcon.constantForeground" Color

[rroessler]

Description

The color for "symbolIcon.constantForeground" was not indexed, and as such would be ignored by VS-Code.

Merge checklist

• Added/updated colors
• Tested in GitHub Light Default theme

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Latest commit: c029d84

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[rroessler]

In looking over the outputs of the "getTheme" function, there are also various "undefined" properties as well. Should I change this pull request to instead add a filter/error handling for bad color values?