Gas price is sometimes not being hex-prefixed

[danfinlay]

https://sentry.io/organizations/metamask/issues/957227585/?project=273505&query=is%3Aunresolved

Since version 6.3.0, so seems to have been introduced there.

The changelog for that version was:

#6300: Gas chart hidden on custom networks
#6301: Fix gas fee in the submitted step of the transaction details activity log
#6302: Replaces the coinbase link in the deposit modal with one for wyre
#6307: Centre the notification in the current window
#6312: Fixes popups not showing when screen size is odd
#6326: Fix oversized loading overlay on gas customization modal.
#6330: Stop reloading dapps on network change allowing dapps to decide if it should refresh or not
#6332: Enable mobile sync
#6333: Redesign of the settings screen
#6340: Cancel transactions and signature requests on the closing of notification windows
#6341: Disable transaction "Cancel" button when balance is insufficient
#6347: Enable privacy mode by default for first time users

A few gas price related things there!