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/pokedex.asm

@@ -182,7 +182,7 @@ Pokedex_RunJumptable: ; 4010b
 	ld a, [wJumptableIndex]
 	ld hl, .Jumptable
 	call Pokedex_LoadPointer
-	jp [hl]
+	jp hl
 
 
 .Jumptable: ; 40115 (10:4115)
@@ -366,7 +366,7 @@ Pokedex_UpdateDexEntryScreen: ; 40258 (10:4258)
 	ld a, [wDexArrowCursorPosIndex]
 	ld hl, DexEntryScreen_MenuActionJumptable
 	call Pokedex_LoadPointer
-	jp [hl]
+	jp hl
 
 .return_to_prev_screen
 	ld a, [LastVolume]
@@ -545,7 +545,7 @@ Pokedex_UpdateOptionScreen: ; 403be (10:43be)
 	ld a, [wDexArrowCursorPosIndex]
 	ld hl, .MenuActionJumptable
 	call Pokedex_LoadPointer
-	jp [hl]
+	jp hl
 
 .return_to_main_screen
 	call Pokedex_BlackOutBG
@@ -647,7 +647,7 @@ Pokedex_UpdateSearchScreen: ; 40471 (10:4471)
 	ld a, [wDexArrowCursorPosIndex]
 	ld hl, .MenuActionJumptable
 	call Pokedex_LoadPointer
-	jp [hl]
+	jp hl
 
 .cancel
 	call Pokedex_BlackOutBG
@@ -1621,7 +1621,7 @@ Pokedex_OrderMonsByMode: ; 40bdc
 	ld a, [wCurrentDexMode]
 	ld hl, .Jumptable
 	call Pokedex_LoadPointer
-	jp [hl]
+	jp hl
 
 
 .Jumptable: ; 40bf0 (10:4bf0)