ESSImport: fix for GMDT being only 92 bytes in a certain save file

apps/essimporter/importgame.cpp

@@ -7,7 +7,20 @@ namespace ESSImport
 
 void GAME::load(ESM::ESMReader &esm)
 {
-    esm.getHNT(mGMDT, "GMDT");
+    esm.getSubNameIs("GMDT");
+    esm.getSubHeader();
+    if (esm.getSubSize() == 92)
+    {
+        esm.getExact(&mGMDT, 92);
+        mGMDT.mSecundaPhase = 0;
+    }
+    else if (esm.getSubSize() == 96)
+    {
+        esm.getT(mGMDT);
+    }
+    else
+        esm.fail("unexpected subrecord size for GAME.GMDT");
+
     mGMDT.mWeatherTransition &= (0x000000ff);
     mGMDT.mSecundaPhase &= (0x000000ff);
     mGMDT.mMasserPhase &= (0x000000ff);