fix: update htmlSafe import to @ember/template rather than @ember/string

[rahulk94]

Description

Update htmlSafe import to @ember/template as the current usage is invalid when using [email protected]+. This fixes the following warnings when using these Ember versions (note that [email protected] is an LTS so its likely to be the version people use for a while yet).

WARNING in ./node_modules/ember-cli-imgix/components/imgix-bg.js 111:11-19
export 'htmlSafe' (imported as 'htmlSafe') was not found in '@ember/string' (possible exports: camelize, capitalize, classify, dasherize, decamelize, getString, getStrings, loc, setStrings, underscore, w)
 @ ./components/imgix-bg.js 1:0-78 1:0-78
 @ ./assets/my-app 864:9-45

Bug Fix

• All existing unit tests are still passing (if applicable)
• Add new passing unit tests to cover the code introduced by your PR
• Add some steps so we can test your bug fix
• The PR title is in the conventional commit format: e.g. fix(<area>): fixed bug #issue-number

Steps to test

This has only been tested using unit tests. It probably is worth testing this against a real world ember app prior to merging (or we send it as its unlikely this will break things).

[commit-lint]

Contributors

rahulk94

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[frederickfogerty]

LGTM