Put this script in a Editor/ folder somewhere...

ShortcutFixForUnity2019.cs

using System.Collections;
using UnityEngine;
using UnityEditor;
using System.Reflection;
using System;
using System.IO;
using System.Diagnostics;


[InitializeOnLoad]
public static class ShortcutFixForUnity2019
{
	static bool FirstCallThisSession
	{
		get
		{
			// returns true once then false other times...
			// reset each time you relaunch unity
			string tempFolder = Application.dataPath.Replace("/Assets", "/Temp");
			string tempFile = tempFolder + "/fixShortcut";
			bool customTempFileExists = File.Exists(tempFile);
			if (!customTempFileExists)
				File.Create(tempFile);
			return !customTempFileExists;
		}

	}

	static ShortcutFixForUnity2019()
	{
		if (FirstCallThisSession)
		{
			// If this is the first call to InitializeOnLoad (unity was just openned)
			// Then we need to wait a bit before calling the FixShortcut function
			EditorApplication.update += Update;
			routine = FixShortcutAfterDelay();
		}
		else
			FixShortcut();
	}

	static void FixShortcut()
	{
		Type ShortcutManagerWindowType = null;
		foreach (var asm in AppDomain.CurrentDomain.GetAssemblies())
		{
			// Find UnityEditor Assembly
			if (asm.FullName.StartsWith("UnityEditor,"))
				ShortcutManagerWindowType = asm.GetType("UnityEditor.ShortcutManagement.ShortcutManagerWindow");
		}
		if (ShortcutManagerWindowType == null)
		{
			UnityEngine.Debug.LogWarning("Cant fix shortcut... type 'UnityEditor.ShortcutManagement.ShortcutManagerWindow' not found");
			return;
		}
		var GetWindowDontShowMethod = typeof(EditorWindow).GetMethod("GetWindowDontShow", BindingFlags.Static | BindingFlags.NonPublic);

		GetWindowDontShowMethod.MakeGenericMethod(ShortcutManagerWindowType).Invoke(null, null);
	}

	// Coroutine stuff ==========================================
	static IEnumerator routine;
	static void Update()
	{
		if (!routine.MoveNext())
		{
			routine = null;
			EditorApplication.update -= Update;
		}
	}
	static IEnumerator FixShortcutAfterDelay()
	{
		Stopwatch stopwatch = new Stopwatch();
		stopwatch.Start();
		int secondsToWait = 2;

		UnityEngine.Debug.Log("Wait " + secondsToWait + " seconds before fixing shortcuts");
		while (stopwatch.ElapsedMilliseconds < secondsToWait * 1000)
			yield return null;
		UnityEngine.Debug.Log("Fix shortcut");
		FixShortcut();
	}
}