added picture control icons

closes #4845

Signed-off-by: Pranam Lashkari <lpranam@collabora.com>
Change-Id: I93eac9d7be31c06353b6fd595f699285b7deadd5

browser/images/dark/lc_insertpicturecontentcontrol.svg

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browser/images/lc_insertpicturecontentcontrol.svg

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