Use heap size from header file

data/data_0_5_0.s

@@ -23,4 +23,3 @@ gUnknown_0865F174:
     .global gUnknown_0865F178
 gUnknown_0865F178:
     .incbin "baserom_sa1.gba", 0x0065F178, 0x4
-    

include/core.h

@@ -244,8 +244,6 @@ extern HBlankFunc gHBlankCallbacks[4];
 extern u8 gNumHBlankCallbacks;
 extern u8 gNumHBlankIntrs;
 
-extern u8 gIwramHeap[0x2204];
-
 extern void *gVramHeapStartAddr;
 extern u16 gVramHeapMaxTileSlots;
 extern u16 gVramHeapState[256];

src/core.c

@@ -115,7 +115,7 @@ u8 gOamFirstPausedIndex ALIGNED(4) = 0;
 u8 gBackgroundsCopyQueueCursor ALIGNED(4) = 0;
 HBlankFunc gHBlankIntrs[4] ALIGNED(16) = {};
 
-u8 gIwramHeap[0x2204] = {};
+u8 gIwramHeap[TASK_HEAP_SIZE] = {};
 
 Sprite *sa2__gUnknown_03004D10[] ALIGNED(16) = {};
 u8 gNumVBlankCallbacks ALIGNED(4) = 0;