[Desktop] Show estimated conversion value in confirm trade window

[srirambv]

Description

Right now we only show price per unit in the confirm trade window. We should also show estimated conversion value in confirm trade window so that price per unit doesn't confuse with the estimated price that they are getting

Actual result:

Expected result:

Show estimated conversation price to make it more clear

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.13.16 Chromium: 84.0.4147.89 (Official Build) nightly (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{# 852}
OS	Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? NA
• Can you reproduce this issue with the dev channel? NA
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

[srirambv]

Verification passed on

Brave	1.14.61 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	Windows 10 OS Version 1809 (Build 17763.1397)

• Verified total conversion value is shown in the trade window
  

---

Verification passed on

Brave	1.14.61 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	Linux

• Verified total conversion value is shown in the trade window
  

---

Verification passed on

Brave	1.14.61 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	macOS Version 10.15.5 (Build 19F101)

• Verified total conversion value is shown in the trade window