Avoid calling FocusRing Hide when already it is hidden state.

Avoid calling FocusRing Hide when already it is hidden state.

    [Version] common
    [Title] FocusRing doesn't come when tap on edit fields.
    [BinType] N/A
    [Customer] HQ
    [Issue#] WEB-3912
    [Problem] FocusRing doesn't come when tap on edit fields.
    [Cause] Contents are getting changed continueously which indirectly calls
            didChangeFocusedRect and it calls hide when already FocusRing state
            is hidden. This will clear showtimer which is set on tap event.
    [Solution] Before calling FocusRing hide we should check whether the state of
            FocusRing is hidden or not. If it is hidden State then don't call Hide.
    [Team] WebCoreSupport
    [Developer] m.gurnaney@samsung.com
    [Request] N/A
    [Horizontal expansion] N/A
    [SCMRequest] NA

    Change-Id: Id2bc3dbcf314bc58bb75d9c586989c680200d0ba

Change-Id: I924c019ace09bc11e24a3742277cbe5e2c15e4d6