Adjust Test Run's exceptions for lock checks

- Revert the blanket exception so Lost and Found won't always have it available
- Won't be considered cheating to go to Test Run on game boot even if not unlocked
- Made the lack of exception for Test Run in Command_Map_f's cheat check more intentional

src/d_main.c

@@ -1908,7 +1908,7 @@ void D_SRB2Main(void)
 				I_Error("Can't get first map of gametype\n");
 			}
 
-			if (M_MapLocked(pstartmap))
+			if (pstartmap != 1 && M_MapLocked(pstartmap))
 			{
 				G_SetUsedCheats();
 			}

src/d_netcmd.c

@@ -2821,7 +2821,7 @@ static void Command_Map_f(void)
 		return;
 	}
 
-	if (M_MapLocked(newmapnum))
+	if (/*newmapnum != 1 &&*/ M_MapLocked(newmapnum))
 	{
 		ischeating = true;
 	}

src/m_cond.c

@@ -1851,7 +1851,7 @@ boolean M_MapLocked(UINT16 mapnum)
 	if (marathonmode)
 		return false;
 
-	if (mapnum <= 1 || mapnum > nummapheaders)
+	if (mapnum == 0 || mapnum > nummapheaders)
 		return false;
 	
 	if (!mapheaderinfo[mapnum-1])