#219 properly close out GUI on error on pocket and coordinator

coordinator/ui/layout/main_view.lua

@@ -14,7 +14,6 @@ local unit_overview = require("coordinator.ui.components.unit_overview")
 
 local core          = require("graphics.core")
 
-local DisplayBox    = require("graphics.elements.displaybox")
 local TextBox       = require("graphics.elements.textbox")
 
 local DataIndicator = require("graphics.elements.indicators.data")
@@ -24,13 +23,11 @@ local TEXT_ALIGN = core.graphics.TEXT_ALIGN
 local cpair = core.graphics.cpair
 
 -- create new main view
----@param monitor table main viewscreen
-local function init(monitor)
+---@param main graphics_element main displaybox
+local function init(main)
     local facility = iocontrol.get_db().facility
     local units = iocontrol.get_db().units
 
-    local main = DisplayBox{window=monitor,fg_bg=style.root}
-
     -- window header message
     local header = TextBox{parent=main,y=1,text="Nuclear Generation Facility SCADA Coordinator",alignment=TEXT_ALIGN.CENTER,height=1,fg_bg=style.header}
     local ping = DataIndicator{parent=main,x=1,y=1,label="SVTT",format="%d",value=0,unit="ms",lu_colors=cpair(colors.lightGray, colors.white),width=12,fg_bg=style.header}
@@ -87,8 +84,6 @@ local function init(monitor)
     process_ctl(main, 2, cnc_bottom_align_start)
 
     imatrix(main, 131, cnc_bottom_align_start, facility.induction_data_tbl[1], facility.induction_ps_tbl[1])
-
-    return main
 end
 
 return init