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doom: Fix "Screen Size" label with BFG IWADs.

In the BFG Edition IWADs, M_SCRNSZ has been changed to contain the
text "Gamepad:" instead, which means that the options menu has a
screen size control that nonsensically has that label. Instead, swap
in the M_DISP lump when using the BFG Edition IWADs, so that it says
"Display" instead.

--- a/src/doom/d_main.c

+++ b/src/doom/d_main.c

@@ -1482,7 +1482,6 @@

         // secret level (MAP33). In Vanilla Doom (meaning the DOS

         // version), MAP33 overflows into the Plutonia level names

         // array, so HUSTR_33 is actually PHUSTR_1.

-

         DEH_AddStringReplacement(HUSTR_31, "level 31: idkfa");

         DEH_AddStringReplacement(HUSTR_32, "level 32: keen");

         DEH_AddStringReplacement(PHUSTR_1, "level 33: betray");

@@ -1496,9 +1495,14 @@

         // The end result is that M_GDHIGH is too wide and causes the game

         // to crash. As a workaround to get a minimum level of support for

         // the BFG edition IWADs, use the "ON"/"OFF" graphics instead.

-

         DEH_AddStringReplacement("M_GDHIGH", "M_MSGON");

         DEH_AddStringReplacement("M_GDLOW", "M_MSGOFF");

+

+        // The BFG edition's "Screen Size:" graphic has also been changed

+        // to say "Gamepad:". Fortunately, it (along with the original

+        // Doom IWADs) has an unused graphic that says "Display". So we

+        // can swap this in instead, and it kind of makes sense.

+        DEH_AddStringReplacement("M_SCRNSZ", "M_DISP");

     }

     // Load Dehacked patches specified on the command line with -deh.