"reject all" doesnt reject all windows

[ashachaf]

Describe the bug
when several transactions are waiting my confirmation, i also have the option to "reject all". when clicking this option, not all waiting transactions are rejected.

To Reproduce

1. go to bancor.network
2. convert any erc20 to erc20 or eth
3. click "reject all"

Expected behavior
all waiting transactions (that are part of the batched transaction) should be rejected

Browser details (please complete the following information):

• OS: macOS 10.14.3
• Browser chrome
• MetaMask Version 6.2.1

[tmashuang]

There is currently an issue with batch transactions we are working to fix, #6264.