Simplify dictionary lookups with GetValueOrDefault()

This is flagged by ReShaper under ID
`CanSimplifyDictionaryTryGetValueWithGetValueOrDefault`.

Author: Susko3

osu.Framework.Tests/Visual/Localisation/LocalisationTestScene.cs

@@ -79,7 +79,7 @@ public TestLocalisationStore(string locale, IReadOnlyDictionary<string, string>
             {
             }
 
-            public string? Get(string key) => translations.TryGetValue(key, out string? value) ? value : null;
+            public string? Get(string key) => translations.GetValueOrDefault(key);
 
             public Task<string?> GetAsync(string key, CancellationToken cancellationToken = default) => Task.FromResult(Get(key));
 

osu.Framework/Graphics/Shaders/ShaderManager.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Concurrent;
+using System.Collections.Generic;
 using System.IO;
 using osu.Framework.Graphics.Rendering;
 using osu.Framework.IO.Stores;
@@ -55,15 +56,15 @@ public IShader Load(string vertex, string fragment)
         /// <param name="fragment">The fragment shader name.</param>
         /// <returns>A cached <see cref="IShader"/> instance, if existing.</returns>
         public virtual IShader? GetCachedShader(string vertex, string fragment)
-            => shaderCache.TryGetValue((vertex, fragment), out IShader? shader) ? shader : null;
+            => shaderCache.GetValueOrDefault((vertex, fragment));
 
         /// <summary>
         /// Attempts to retrieve an already-cached shader part.
         /// </summary>
         /// <param name="name">The name of the shader part.</param>
         /// <returns>A cached <see cref="IShaderPart"/> instance, if existing.</returns>
         public virtual IShaderPart? GetCachedShaderPart(string name)
-            => partCache.TryGetValue(name, out IShaderPart? part) ? part : null;
+            => partCache.GetValueOrDefault(name);
 
         /// <summary>
         /// Attempts to retrieve the raw data for a shader file.

osu.Framework/Graphics/Transforms/TargetGroupingTransformTracker.cs

@@ -368,10 +368,7 @@ private int getLastAppliedIndex(string targetMember = null)
                 return min;
             }
 
-            if (lastAppliedTransformIndices.TryGetValue(targetMember, out int val))
-                return val;
-
-            return 0;
+            return lastAppliedTransformIndices.GetValueOrDefault(targetMember, 0);
         }
 
         /// <summary>

osu.Framework/Input/InputManager.cs

@@ -209,7 +209,7 @@ protected virtual MouseButtonEventManager CreateButtonEventManagerFor(MouseButto
         /// <param name="button">The button to find the manager for.</param>
         /// <returns>The <see cref="MouseButtonEventManager"/>.</returns>
         public MouseButtonEventManager GetButtonEventManagerFor(MouseButton button) =>
-            mouseButtonEventManagers.TryGetValue(button, out var manager) ? manager : null;
+            mouseButtonEventManagers.GetValueOrDefault(button);
 
         /// <summary>
         /// Create a <see cref="KeyEventManager"/> for a specified key.