Remove reference to deleted files

Author: roji

src/Npgsql.EntityFrameworkCore.PostgreSQL/Npgsql.EntityFrameworkCore.PostgreSQL.csproj

@@ -81,13 +81,11 @@
     <Compile Include="Metadata\NpgsqlValueGenerationStrategy.cs" />
     <Compile Include="Metadata\PostgresExtension.cs" />
     <Compile Include="Migrations\MigrationBuilderExtensions.cs" />
-    <Compile Include="Migrations\Operations\NpgsqlEnsurePostgresExtensionOperation.cs" />
     <Compile Include="Migrations\Operations\NpgsqlCreateDatabaseOperation.cs" />
     <Compile Include="Migrations\Operations\NpgsqlDropDatabaseOperation.cs" />
     <Compile Include="Migrations\Internal\NpgsqlHistoryRepository.cs" />
     <Compile Include="Migrations\Internal\NpgsqlMigrationsAnnotationProvider.cs" />
     <Compile Include="Migrations\NpgsqlMigrationsSqlGenerator.cs" />
-    <Compile Include="Migrations\Operations\NpgsqlDropPostgresExtensionOperation.cs" />
     <Compile Include="NpgsqlModelBuilderExtensions.cs" />
     <Compile Include="NpgsqlPostgresExtensionBuilder.cs" />
     <Compile Include="Query\ExpressionTranslators\Internal\NpgsqlCompositeMemberTranslator.cs" />