- Renamed Prefix to prefix

- Updated some command string keys which were using command name to use method names now

src/NadekoBot/Modules/Games/Hangman/HangmanCommands.cs

@@ -10,7 +10,7 @@ public partial class Games
         [Cmd]
         [RequireContext(ContextType.Guild)]
         public async partial Task Hangmanlist()
-            => await SendConfirmAsync(GetText(strs.hangman_types(Prefix)), _service.GetHangmanTypes().Join('\n'));
+            => await SendConfirmAsync(GetText(strs.hangman_types(prefix)), _service.GetHangmanTypes().Join('\n'));
 
         private static string Draw(HangmanGame.State state)
             => $@". ┌─────┐

src/NadekoBot/Modules/Games/SpeedTyping/SpeedTypingCommands.cs

@@ -27,7 +27,7 @@ public partial class Games
             var channel = (ITextChannel)ctx.Channel;
 
             var game = _service.RunningContests.GetOrAdd(ctx.Guild.Id,
-                _ => new(_games, _client, channel, Prefix, options, _eb));
+                _ => new(_games, _client, channel, prefix, options, _eb));
 
             if (game.IsActive)
                 await SendErrorAsync($"Contest already running in {game.Channel.Mention} channel.");

src/NadekoBot/Modules/Games/Trivia/TriviaCommands.cs

@@ -50,7 +50,7 @@ public partial class Games
                 channel.Guild,
                 channel,
                 opts,
-                Prefix + "tq",
+                prefix + "tq",
                 _eb);
             if (_service.RunningTrivias.TryAdd(channel.Guild.Id, trivia))
             {