CI: remove i686-windows-gnu condition

rust-lang/rust#50176 has been fixed.

Author: YaLTeR

.github/workflows/vapoursynth.yml

@@ -175,8 +175,6 @@ jobs:
         cd sample-plugin
         cargo build --verbose
     - name: Run sample-plugin tests
-      # https://github.com/rust-lang/rust/issues/50176
-      if: matrix.toolchain != 'stable-i686-pc-windows-gnu'
       run: |
         $Env:Path += ";C:\Program Files\VapourSynth;"
         cd sample-plugin