Fix spinjs 1.3

[bpolaszek]

Please tag 1.3.8 to allow 1.3.x users to continue using the bundle before considering upgrading.

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⚠️⚠️⚠️ THIS BUNDLE HAS ENTERED INTO ITS FEATURE FREEZE PERIOD ⚠️⚠️⚠️

• Pull Requests with New Features will no longer be merged.
• If you want to propose some new feature, please create an Issue.
• Pull Requests that fix bugs are still accepted and greatly appreciated.

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[shakaran]

@bpolaszek thanks for your contribution!. It seems that it was needed backport the change from master. Since it seems that your PR has some mess with other commits, I just push the change properly and release 1.3.8 https://github.com/avanzu/AdminThemeBundle/commit/ed9a11f4c002bbc542adb680bddc5222e11e85a6