Fix issues discovered via TypeMaker (#87596)

## About The Pull Request
Fixes issues with var typing and proc arguments, discovered using
OpenDream's WIP TypeMaker feature (using improvements I haven't PR'd
upstream yet).

## Why It's Good For The Game
Codebase maintenance.

code/modules/wiremod/components/action/laserpointer.dm

@@ -11,8 +11,8 @@
 
 	/// The input port
 	var/datum/port/input/target_input
-	var/datum/port/input/image_pixel_x = 0
-	var/datum/port/input/image_pixel_y = 0
+	var/datum/port/input/image_pixel_x
+	var/datum/port/input/image_pixel_y
 
 	var/max_range = 7
 

code/modules/wiremod/components/admin/getvar.dm

@@ -45,7 +45,7 @@
 			output_value.set_datatype(expected_output_type.value)
 
 /obj/item/circuit_component/get_variable/input_received(datum/port/input/port)
-	var/atom/object = entity?.value
+	var/datum/object = entity?.value
 	if(getvar_options.value == "Global")
 		object = GLOB