Condense indentation levels of else-if chain in "play" menu

Previously, the code looked something like:

    else { if (...) {...} else { if (...) {...} else { etc. } }

And kept indenting every time there was an else-if.

This commit puts all else-ifs on the same indentation level, so it
doesn't slowly push the code to the right.

desktop_version/src/Game.cpp

@@ -6923,30 +6923,24 @@ void Game::createmenu( std::string t )
                 createmenu("unlocknodeathmode");
                 savemystats = true;
             }
-            else
-            {
             //Alright then! Flip mode?
-                if (unlock[5] && !unlocknotify[18])
+            else if (unlock[5] && !unlocknotify[18])
             {
                 unlock[18] = true;
                 unlocknotify[18] = true;
                 createmenu("unlockflipmode");
                 savemystats = true;
             }
-                else
-                {
             //What about the intermission levels?
-                    if (unlock[7] && !unlocknotify[16])
+            else if (unlock[7] && !unlocknotify[16])
             {
                 unlock[16] = true;
                 unlocknotify[16] = true;
                 createmenu("unlockintermission");
                 savemystats = true;
             }
-                    else
-                    {
             //ok, secret lab! no notification, but test:
-                        if (unlock[8])
+            else if (unlock[8])
             {
                 createmenu("playsecretlab");
             }
@@ -6961,9 +6955,6 @@ void Game::createmenu( std::string t )
             }
         }
     }
-            }
-        }
-    }
     else if (t == "unlocktimetrial" || t == "unlocktimetrials")
     {
         option("continue");