misc: chore: Use explicit types & fix object creation

src/Ryujinx.HLE/HOS/Services/Account/Acc/AccountManager.cs

@@ -191,10 +191,10 @@ namespace Ryujinx.HLE.HOS.Services.Account.Acc
 
         private void DeleteSaveData(UserId userId)
         {
-            var saveDataFilter = SaveDataFilter.Make(programId: default, saveType: default,
+            SaveDataFilter saveDataFilter = SaveDataFilter.Make(programId: default, saveType: default,
                 new LibHac.Fs.UserId((ulong)userId.High, (ulong)userId.Low), saveDataId: default, index: default);
 
-            using var saveDataIterator = new UniqueRef<SaveDataIterator>();
+            using UniqueRef<SaveDataIterator> saveDataIterator = new();
 
             _horizonClient.Fs.OpenSaveDataIterator(ref saveDataIterator.Ref, SaveDataSpaceId.User, in saveDataFilter).ThrowIfFailure();
 

src/Ryujinx.HLE/HOS/Services/Account/Acc/AccountSaveDataManager.cs

@@ -5,6 +5,7 @@ using Ryujinx.Common.Utilities;
 using Ryujinx.HLE.HOS.Services.Account.Acc.Types;
 using System;
 using System.Collections.Concurrent;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 
@@ -28,7 +29,7 @@ namespace Ryujinx.HLE.HOS.Services.Account.Acc
                 {
                     ProfilesJson profilesJson = JsonHelper.DeserializeFromFile(_profilesJsonPath, _serializerContext.ProfilesJson);
 
-                    foreach (var profile in profilesJson.Profiles)
+                    foreach (UserProfileJson profile in profilesJson.Profiles)
                     {
                         UserProfile addedProfile = new(new UserId(profile.UserId), profile.Name, profile.Image, profile.LastModifiedTimestamp);
 
@@ -68,7 +69,7 @@ namespace Ryujinx.HLE.HOS.Services.Account.Acc
                 LastOpened = LastOpened.ToString(),
             };
 
-            foreach (var profile in profiles)
+            foreach (KeyValuePair<string, UserProfile> profile in profiles)
             {
                 profilesJson.Profiles.Add(new UserProfileJson()
                 {

src/Ryujinx.HLE/HOS/Services/Account/Acc/AccountService/ManagerServer.cs

@@ -51,7 +51,7 @@ namespace Ryujinx.HLE.HOS.Services.Account.Acc.AccountService
             byte[] deviceAccountId = new byte[0x10];
             RandomNumberGenerator.Fill(deviceAccountId);
 
-            var descriptor = new SecurityTokenDescriptor
+            SecurityTokenDescriptor descriptor = new()
             {
                 Subject = new ClaimsIdentity([new Claim(JwtRegisteredClaimNames.Sub, Convert.ToHexString(rawUserId).ToLower())]),
                 SigningCredentials = credentials,