mpg123audiodec: Fix gst_mpg123_audio_dec_pop_oldest_clip_info() behavior

The oldest clip info is at position 0 in the clip info array.
34 jobs for !344 with fix-mp1-mp2-mp3-gapless in 3 minutes and 55 seconds (queued for 2 seconds)
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Status Job ID Name Coverage
  Build Docker
passed alpine amd64 manifest builder docker #10364363

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passed android docker #10364362

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passed cerbero fedora amd64 docker #10364361

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passed gst-indent amd64 docker #10364364

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passed windows amd64 docker #10364365
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  Preparation
passed check allow-edit #10364368

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passed gst indent #10364367

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  Build
created build cerbero cross-android universal #10364377
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created build cerbero cross-ios universal #10364381
gst-ios-14.3
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created build cerbero fedora x86_64 #10364376
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created build cerbero macos x86_64 #10364380
gst-macos-11.1
created build cerbero msvc x86_64 #10364382
docker windows gstreamer-windows 1809
created build clang fedora x86_64 #10364372
created build msys2 #10364375
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created build nodebug fedora x86_64 #10364369
created build static fedora x86_64 #10364370
created build static nodebug fedora x86_64 #10364371
created build vs2017 amd64 #10364373
docker windows 1809
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  Test
created check fedora #10364383
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  Integrate
created cross-android universal examples #10364391
created cross-ios universal examples #10364393
gst-ios-14.3
created documentation #10364392