Form tab: Add missing icons for control actions

copied from core

Signed-off-by: Pedro Pinto da Silva <pedro.silva@collabora.com>
Change-Id: Ic22f4dd885094a268c755e1ebb60c157d775bf06

browser/images/lc_contentcontrolproperties.svg

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browser/images/lc_insertdropdowncontentcontrol.svg

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+<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="m2 2h20v20h-20z" fill="#3a3a38"/><g fill="#fafafa"><path d="m15 7h6v14h-6z"/><path d="m3 3h11v3h-11z"/><path d="m3 7h11v14h-11z"/></g><g fill="#3a3a38"><rect height="1" ry=".5" width="9" x="4" y="9"/><rect height="1" ry=".5" width="9" x="4" y="12"/><rect height="1" ry=".5" width="9" x="4" y="15"/><rect height="1" ry=".5" width="9" x="4" y="18"/></g><g fill-rule="evenodd"><path d="m15 3 3 3 3-3z" fill="#fafafa"/><g fill="#3a3a38"><path d="m16 17 2 3 2-3z"/><path d="m16 11 2-3 2 3z"/></g></g></svg>