[Android] Set ANDROID_HOME instead of deprecated ANDROID_SDK_ROOT

[mosabab]

Platforms affected

Android

Motivation and Context

Closes https://github.com/apache/cordova-docs/issues/1296

ANDROID_HOME is default Since this PR: https://github.com/apache/cordova-android/pull/1471 The documentation should be deal with latest updates. Because ANDROID_HOME is new default and ANDROID_SDK_ROOT is deprecated.

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Also to insure that Android SDK Command-line Tools is selected.

Description

Testing

Checklist

• [x] I've run the tests to see all new and existing tests pass
• [x] I added automated test coverage as appropriate for this change
• [x] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [x] I've updated the documentation if necessary

[mosabab]

@breautek Thanks for explain.