Lint more const string prototypes (#18922)

Content.Server/Speech/EntitySystems/RatvarianLanguageSystem.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using System.Text;
 using System.Text.RegularExpressions;
 using Content.Shared.Speech.Components;
 using Content.Shared.Speech.EntitySystems;
@@ -9,6 +9,9 @@ namespace Content.Server.Speech.EntitySystems;
 public sealed class RatvarianLanguageSystem : SharedRatvarianLanguageSystem
 {
     [Dependency] private readonly StatusEffectsSystem _statusEffects = default!;
+
+
+    [ValidatePrototypeId<StatusEffectPrototype>]
     private const string RatvarianKey = "RatvarianLanguage";
 
     // This is the word of Ratvar and those who speak it shall abide by His rules:

Content.Server/Speech/EntitySystems/SlurredSystem.cs

@@ -12,6 +12,7 @@ public sealed class SlurredSystem : SharedSlurredSystem
     [Dependency] private readonly StatusEffectsSystem _statusEffectsSystem = default!;
     [Dependency] private readonly IRobustRandom _random = default!;
 
+    [ValidatePrototypeId<StatusEffectPrototype>]
     private const string SlurKey = "SlurredSpeech";
 
     public override void Initialize()

Content.Server/Speech/EntitySystems/StutteringSystem.cs

@@ -12,8 +12,6 @@ namespace Content.Server.Speech.EntitySystems
         [Dependency] private readonly StatusEffectsSystem _statusEffectsSystem = default!;
         [Dependency] private readonly IRobustRandom _random = default!;
 
-        private const string StutterKey = "Stutter";
-
         // Regex of characters to stutter.
         private static readonly Regex Stutter = new(@"[b-df-hj-np-tv-wxyz]",
             RegexOptions.Compiled | RegexOptions.IgnoreCase);