Applying the same colors (CSS colors) used on the dashboard, for consistency.

[rdwebdesign]

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What does this PR aim to accomplish?:

The graph on "db_graph.php" has hard-coded colors for the bars, but the dashboard graph uses the CSS theme colors.

On PR #1977, the grid and tick colors were "imported", but bar colors were not.
This PR changes the hard-coded values and uses the CSS colors.

How does this PR accomplish the above?:

Applying the same technique used in the dashboard to import the colors defined via CSS and then use the colors in javascript code.

What documentation changes (if any) are needed to support this PR?:

none.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-12-web-v5-9-and-core-v5-7-released/51795/1