Input value should be reset to 0 when network is changed

[srirambv]

Description

Input value should be reset to 0 when network is changed.

Steps to Reproduce

1. Set network to Ethereum
2. Click preset value on send tab
3. Change network where there is no balance
4. Because the preset value is already set and new network doesn't have balance shows insufficient funds message

Actual result:

Screen.Recording.2021-11-10.at.11.21.06.AM.mov

Expected result:

Maybe reset so it doesn't keep showing Insufficient funds error message when network is changed

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.32.95 Chromium: 95.0.4638.69 (Official Build) beta (x86_64)
Revision	6a1600ed572fedecd573b6c2b90a22fe6392a410-refs/branch-heads/4638@{#984}
OS	All

Version/Channel Information:

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

cc: @jamesmudgett

[srirambv]

Brave	1.35.82 Chromium: 97.0.4692.71 (Official Build) beta (64-bit)
Revision	adefa7837d02a07a604c1e6eff0b3a09422ab88d-refs/branch-heads/4692@{#1247}
OS	☑️ Linux	☑️ Windows 11 Version Dev (Build 22523.1000)	☑️ macOS Version 12.0.1 (Build 21C52)
Verified steps from issue description Verified input value is reset when network is changed
	19354-Linux.mp4	19354-Windows.mov	19354-macOS.mov