fix: same title for Cybersource and LiqPay buttons for legacy

[DmytroAlipov]

This is a backport from master

Description

For the legacy page of the course payment selection, there is a scenario when we have two Checkout buttons. It is not clear what payment they are intended for.

This is how it looks after fixing:

[openedx-webhooks]

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[mphilbrick211]

Hi @colinbrash and @openedx/revenue-squad! Could someone please review/merge this for us? Thanks!

[nedbat]

This is a merge into Palm. The BTR group can review and merge it.

[mphilbrick211]

This is a merge into Palm. The BTR group can review and merge it.

@nedbat hi there! Just following up to see if this can be merged?