Spelling error in ToolbarController.php [#3365736]

Problem/Motivation

The themeRebuild() function returns some feedback to the user with the string "Theme registry rebuilded." but this should read "Theme registry rebuilt."

Steps to reproduce

See line 291 of the file admin_toolbar/admin_toolbar_tools/src/Controller/ToolbarController.php

Proposed resolution

Fix spelling error.

Issue fork admin_toolbar-3365736

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3365736-spelling-error-in changes, plain diff MR !59
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