Fix target framework for quartz package.

Author: hikalkan

src/Abp.Quartz/Abp.Quartz.csproj

@@ -20,8 +20,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <None Include="bin\Release\net461\Abp.Quartz.pdb">
-      <PackagePath>lib/net461/</PackagePath>
+    <None Include="bin\Release\netstandard2.0\Abp.Quartz.pdb">
+      <PackagePath>lib/netstandard2.0/</PackagePath>
       <Pack>true</Pack>
     </None>
   </ItemGroup>
@@ -34,9 +34,4 @@
     <PackageReference Include="Quartz" Version="3.0.4" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
 </Project>