Replace ‘jp [hl]’ with ‘jp hl’

The former is arguably misleading (as you don’t access the memory location in hl to retrieve the jump location), and is consequently deprecated in newer versions of rgbds.

This fix silences these deprecation warnings.

engine/pack.asm

@@ -23,7 +23,7 @@ Pack: ; 10000
 	ld a, [wJumptableIndex]
 	ld hl, .Jumptable
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 10030
 
@@ -144,7 +144,7 @@ Pack: ; 10000
 	ld a, [wMenuCursorY]
 	dec a
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 10124 (4:4124)
 .MenuDataHeader1: ; 0x10124
@@ -306,7 +306,7 @@ Pack: ; 10000
 	ld a, [wMenuCursorY]
 	dec a
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 10249 (4:4249)
 MenuDataHeader_UsableKeyItem: ; 0x10249
@@ -689,7 +689,7 @@ BattlePack: ; 10493
 	ld a, [wJumptableIndex]
 	ld hl, .Jumptable
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 104c3
 
@@ -846,7 +846,7 @@ TMHMSubmenu: ; 105dc (4:45dc)
 	ld a, [wMenuCursorY]
 	dec a
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 10601 (4:4601)
 .UsableMenuDataHeader: ; 0x10601
@@ -997,7 +997,7 @@ DepositSellPack: ; 106be
 	ld a, [wJumptableIndex]
 	ld hl, .Jumptable
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 106d1
 
@@ -1144,7 +1144,7 @@ TutorialPack: ; 107bb
 	ld a, [wJumptableIndex]
 	ld hl, .dw
 	call Pack_GetJumptablePointer
-	jp [hl]
+	jp hl
 
 ; 107e1