WasmPWAManifestFile is not overriden properly

[jeromelaban]

Current behavior

The manifest used in the index.html points to a file that does not exist:

Expected behavior

The WasmPWAManifestFile property should be overriden by resizetizer before BuildDist.

[jeromelaban]

Portion of the fix:

  <Target Name="_adjustJson" BeforeTargets="BuildDist">
    <PropertyGroup>
      <WasmPWAManifestFile>$(_UnoIntermediateAppIcon)/Unomanifest.webmanifest</WasmPWAManifestFile>
    </PropertyGroup>
  </Target>

Also, $(_UnoIntermediateAppIcon)/Unomanifest.webmanifest should not be set as Content, as the bootstrapper automatically copies the file at the root of the resulting dist.