fix: RTL arrowLeft in core assets

[RawanMatar89]

New contributor

I'm Rawan Matar, from ZeitLabs.
I start working on supporting RTL in OpenEdx iOS app, and this is the first change in my plan.

Description

changed the direction attribute of the "arrowLeft" image in Core/Assets.

Screenshots

Before	After

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[volodymyr-chekyrta]

Hi @RawanMatar89, thank you for your contribution!
LGTM 👍

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@RawanMatar89 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[OmarIthawi]

Thanks @RawanMatar89 and @volodymyr-chekyrta!! We're looking forward for more fixes in regards to RTL and SAML.