[wasm] Update path to regex tests project, to be excluded for AOT (#66044)

The project path changed in b4c746b7,
causing the project to not get excluded on CI, and causing OOM failures
on rolling builds.

src/libraries/tests.proj

@@ -33,7 +33,7 @@
   <!-- Wasm aot on all platforms -->
   <ItemGroup Condition="'$(TargetOS)' == 'Browser' and '$(BuildAOTTestsOnHelix)' == 'true' and '$(RunDisabledWasmTests)' != 'true' and '$(RunAOTCompilation)' == 'true'">
     <!-- https://github.com/dotnet/runtime/issues/61756 -->
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.RegularExpressions\tests\System.Text.RegularExpressions.Tests.csproj" />
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.RegularExpressions\tests\FunctionalTests\System.Text.RegularExpressions.Tests.csproj" />
 
     <!-- https://github.com/dotnet/runtime/issues/65356 - OOM while linking -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.Json\tests\System.Text.Json.SourceGeneration.Tests\System.Text.Json.SourceGeneration.Roslyn3.11.Tests.csproj" />