Fix compatibility with new libnds

Author: Hydr8gon

src/main.cpp

@@ -51,11 +51,7 @@ int main()
     consoleInit(nullptr, 0, BgType_Text4bpp, BgSize_T_256x256, 2, 0, false, true);
 
     // Initialize maxmod without a soundbank
-    mm_ds_system sys;
-    sys.mod_count    = 0;
-    sys.samp_count   = 0;
-    sys.mem_bank     = 0;
-    sys.fifo_channel = FIFO_MAXMOD;
+    mm_ds_system sys = {};
     mmInit(&sys);
 
     // Initialize the game

src/menu.cpp

@@ -185,7 +185,10 @@ void menuInit()
     dmaCopy(song_listPal, BG_PALETTE_SUB, 3 * sizeof(uint16_t));
     bgSetRotateScale(bg, 0, 1 << 7, 1 << 8);
     bgUpdate();
+
+    // Set and enable the H-blank interrupt
     irqSet(IRQ_HBLANK, bgHBlank);
+    REG_DISPSTAT |= BIT(4);
 }
 
 void songList()