[XAM] ProfileManager: Renamed GetProfiles to GetAccounts

This is to prevent confusion between signed-in accounts (aka. Profiles) and all entries (Accounts)

Also added GetAccount to get specific instead of all of them when not needed

src/xenia/kernel/xam/profile_manager.cc

@@ -466,6 +466,14 @@ bool ProfileManager::CreateProfile(const std::string gamertag, bool autologin,
   return is_account_created;
 }
 
+const X_XAMACCOUNTINFO* ProfileManager::GetAccount(const uint64_t xuid) {
+  if (!accounts_.count(xuid)) {
+    return nullptr;
+  }
+
+  return &accounts_[xuid];
+}
+
 bool ProfileManager::CreateAccount(const uint64_t xuid,
                                    const std::string gamertag) {
   X_XAMACCOUNTINFO account = {};