Revert "vaapi: Demote vaapidecodebin to rank NONE."

This reverts commit 7a25c5d4.

Part-of: <!436>
18 jobs for master in 50 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build Docker
passed alpine amd64 manifest builder docker #11928557

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passed android docker #11928556

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passed cerbero fedora amd64 docker #11928555

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passed fedora amd64 docker #11928554

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passed gst-indent amd64 docker #11928558

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passed windows amd64 docker #11928559
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  Preparation
passed gst indent #11928561

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manual manifest #11928560
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  Build
created build clang fedora x86_64 #11928565
created build nodebug fedora x86_64 #11928562
created build static fedora x86_64 #11928563
created build static nodebug fedora x86_64 #11928564
 
  Test
created check fedora #11928566
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  Integrate
created documentation #11928571