[explorer] Fix parsing of some Pyth transactions.

[guibescos]

Problem

Some transactions related to the Pyth oracle are not displayed properly.

Summary of Changes

• Fix a bug where the instruction setMinimumPublishers was not recognized
• Fix a bug where the public keys in the instruction payload to AddPublisher and DeletePublisher where not deserialized properly.

Fixes #

[steviez]

@ngundotra - This one in your wheelhouse ?

[ngundotra]

@guibescos can you post screenshots of the current (buggy) explorer and screenshots of what it looks like with your fix?

Please also post some links for myself and others to check.

Thank you

[guibescos]

@ngundotra
Bug 1 : left is current, right is after the change

https://explorer.solana.com/tx/4pzXLVAPsayQy935jNwE7uhBzxJ7qCzp3xNXbs9c7qzTwzLzzVAGbbvSrLhsViVfdDGBHzMKrNRQB7iUHgUhXK8M?cluster=devnet
Bug 2 : left is current, right is after the change

https://explorer.solana.com/tx/5QS5zfmRfoSGWH5dTGiVF23vkjYCFYuuLrpZz46E2uVvKiFmPs25n9QUUrL5aXefVHD8mEGVSzKYucYTuxb5JBD8?cluster=devnet
Publisher in picture 1 is not what it should be.

[guibescos]

@ngundotra Please don't let this small PR get buried

[ngundotra]

@guibescos Looks good to me. Thanks for fixing!