Fix separators in different sections of interface

[TanyaEfremova]

Bug description

1. Modals: Decrease separator thickness to 1px (as we don't have 2px dividers anywhere else). This should be applied to all modals, not only modals shown below.

   

2. Swaps: Remove a line above the order details in expanded transactions in history and queue (we don't have them in other transactions)

   

Environment

• Browser: Chrome
• Wallet: MetaMask
• Chain: Ethereum mainnet

Steps to reproduce

1. Go to e.g. Address book and click Import or Export, see modal
2. Make a swap and expand a transaction in history and/or queu

Expected result

Described above.

Obtained result

Screenshots

[MHarisAshfaq]

Hi @TanyaEfremova, I hope you're doing well. I just wanted to ask a question

• How many modals require a separator thickness update to 1px?

[TanyaEfremova]

Hey @MHarisAshfaq , here is an overview of all the modals requiring adjusted separators.

In total, it is 5 modals.

[MHarisAshfaq]

@TanyaEfremova Please assign this task to me. I want to do it.

[MHarisAshfaq]

@TanyaEfremova I have raised the PR for this issue. Please assign the relevant person for the review. Thank you for the guidance.