more config key adjustments

Author: rofr

src/Memstate.Postgresql.Tests/PostgresqlSettingsTests.cs

@@ -101,15 +101,15 @@ public void DatabaseOverridesConnectionString()
         public void PasswordFromArgumentsOverridesConnectionString()
         {
             var expected = Guid.NewGuid().ToString();
-            var settings = new MemstateSettings("--Memstate:StorageProviders:Postgresql:Password", expected);
+            var settings = new MemstateSettings("--Memstate:StorageProviders:Postgres:Password", expected);
             var pgSettings = new PostgresqlSettings(settings);
             Assert.Equal(expected, pgSettings.Password);
         }
 
         [Fact(Skip="Interferes with same ENV var on appveyor!")]
         public void PasswordFromEnvironmentVariableOverridesConnectionString()
         {
-            string key = "Memstate:StorageProviders:Postgresql:Password";
+            string key = "Memstate:StorageProviders:Postgres:Password";
             var expected = Guid.NewGuid().ToString();
             Environment.SetEnvironmentVariable(key, expected);
             var settings = new MemstateSettings();