Downgrade SmartFormat.NET

The new version is doing weird things, like warning more than 2 plural forms
for English

src/SyncTrayzor/SyncTrayzor.csproj

@@ -597,7 +597,7 @@
       <Version>1.5.2</Version>
     </PackageReference>
     <PackageReference Include="SmartFormat.NET">
-      <Version>2.5.3</Version>
+      <Version>2.0.0</Version>
     </PackageReference>
     <PackageReference Include="Stylet">
       <Version>1.3.5</Version>