Added fix to Keep the Camera from Making Waves

[pkmnsnfrn]

Implements https://github.com/pret/pokeemerald/wiki/Keep-the-Camera-from-Making-Waves as a BUGFIX, stolen from @tustin2121 with permission. I opted against the invisible option as the camera seems like the more applicable version.

Description

BUGFIX On	BUGFIX Off

Testing

// data/maps/InsideOfTruck/scripts.inc
InsideOfTruck_EventScript_MovingBox::
+    warp MAP_PETALBURG_CITY,0
	msgbox InsideOfTruck_Text_BoxPrintedWithMonLogo, MSGBOX_SIGN
	end

// data/maps/PetalburgCity/scripts.inc
PetalburgCity_EventScript_Boy::
+    special SpawnCameraObject
+    applymovement OBJ_EVENT_ID_CAMERA, WalkAway
	lock
	faceplayer
	msgbox PetalburgCity_Text_WaterReflection, MSGBOX_DEFAULT
	closemessage
	applymovement LOCALID_BOY, Common_Movement_FaceOriginalDirection
	waitmovement 0
	release
	end

+ WalkAway:
+    walk_down
+    walk_down
+    walk_down
+    walk_left
+    walk_left
+    walk_left
+    step_end

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I am pkmnsnfrn.