Fix spacing issue in Settings Search input

[ryanml]

Fix: #17100

Explanation

This bug was introduced in #16903 with the use of .trim(). As input is sanitized upon entry, always trimming the trailing whitespace will result in the denial of space entry. Using trimStart() will produce the desired effect of preventing leading whitespaces, while still allowing for normal space entry in between query terms.

Screenshots/Screencaps

Before

(Space key doesn't work)

before.mov

After

fix-17100.mov

Manual Testing Steps

1. Click to Settings
2. Attempt to enter a query containing spaces, such as currency conversion
3. Ensure that the query can be entered as expected with spaces

Pre-merge author checklist

• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

Pre-merge reviewer checklist

• Manual testing (e.g. pull and build branch, run in browser, test code being changed)
• PR is linked to the appropriate GitHub issue
• IF this PR fixes a bug in the release milestone, add this PR to the release milestone

If further QA is required (e.g. new feature, complex testing steps, large refactor), add the Extension QA Board label.

In this case, a QA Engineer approval will be be required.

[georgewrmarshall]

Code LGTM! Took the liberty of adding a "before" video showing the space key not working

[metamaskbot]

Builds ready [b6526e3]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 2, 3, 4
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1402 ± 122 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	97	146	117	14	7
		domContentLoaded	1148	2180	1379	249	119
		load	1148	2181	1402	254	122
		domInteractive	1148	2180	1379	249	119

Bundle size diffs

• background: 0 bytes
• ui: 5 bytes
• common: 0 bytes

highlights:

storybook

• ui/pages/settings/settings-search/settings-search.stories.js
• ui/pages/settings/settings.stories.js