Active region zooms on flare forecast has some errors

[dpshelio]

Originally reported by: Eoin Carley (Bitbucket: ecarley, GitHub: Unknown)

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If an active region is clicked on the FPS page, a zoom open as usual. The numbers below the histograms need to be removed.
Also, a scroll back through the history of the active region eventual leads to a blank image when no zoom existed.

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• Bitbucket: https://bitbucket.org/solarmonitor/solarmonitorphp/issue/15