fix: claiming enabled while claiming

When a user clicks "Claim" the other "Claim"
buttons for the rest of the available transcripts
should be disabled. That's not happening.
This commit fixes this.

Although the buttons were clickable the user
could not claim multiple transcripts. The only
side-effect was that with every click the
`/api/github/{fork,newBranch}` endpoints
were called, therefore creating a new "review
branch" for every click.

src/components/tables/QueueTable.tsx

@@ -347,6 +347,7 @@ const QueueTable = () => {
           modifier: (data) => data.id,
           component: (data) => (
             <Button
+              isDisabled={claimState.rowId !== -1}
               isLoading={data.id == claimState.rowId}
               bgColor={"#EB9B00"}
               color="white"