Set UseMonoRuntime=false to workaround WABT restore issue

Author: akoeplinger

src/mono/wasi/Wasi.Build.Tests/Directory.Build.props

@@ -20,5 +20,7 @@
     <RuntimeIdentifier>$(OutputRID)</RuntimeIdentifier>
     <SelfContained>true</SelfContained>
     <PublishTrimmed>true</PublishTrimmed>
+    <!-- TODO: this is necessary to workaround restoring Mono desktop runtime packs, check whether this project really should be self-contained -->
+    <UseMonoRuntime>false</UseMonoRuntime>
   </PropertyGroup>
 </Project>

src/mono/wasm/Wasm.Build.Tests/Directory.Build.props

@@ -19,5 +19,7 @@
   <PropertyGroup>
     <RuntimeIdentifier>$(OutputRID)</RuntimeIdentifier>
     <SelfContained>true</SelfContained>
+    <!-- TODO: this is necessary to workaround restoring Mono desktop runtime packs, check whether this project really should be self-contained -->
+    <UseMonoRuntime>false</UseMonoRuntime>
   </PropertyGroup>
 </Project>