[Client] When renaming masteries list during the New Champion Select, the old name still appears

Bug Type: Functionality Class: A/B Location: New Champion Select Reproduction rate: 10/10

Description: When renaming masteries list during the New Champion Select, the old name still appears when you press the drop down. The new name still appears once selected, however. This issue may create a confusion and will have players select different masteries.

Steps to Reproduce:

1. Launch the game
2. Login onto EUW server
3. Select Play -> Summoners Rift -> Ranked Draft
4. Select desired roles and queue up
5. Once in a champion select, edit masteries and rename any of the available pages and save it
6. Click on drop down button on Masteries list
7. Observe no name change in the list

Actual Result: The renamed masteries in the drop down list appear with old name.

Expected Result: The name is correctly displayed after it was changed.

Notes: Please click here for screenshot. Please note that this issue may appear in other modes and on other servers.