[[ Bug ]] Fix message box errors

This patch fixes a couple of object reference errors in the message
box when the handlers are executed while on the wrong card.

Author: montegoulding

Toolset/palettes/message box/behaviors/revmessageboxbehavior.livecodescript

@@ -667,8 +667,8 @@ private command __UpdateIntelligenceDisplay
    else
       local tControl
       put the name of it into tControl
-      set the label of button "Open Stacks" of group "Stacks" of me to tIntelligence & ": " & tControl
-      enable button "Open Stacks" of group "Stacks" of me
+      set the label of button "Open Stacks" of group "Stacks" of card "Single Line" of me to tIntelligence & ": " & tControl
+      enable button "Open Stacks" of group "Stacks" of card "Single Line" of me
    end if
    positionOpenStacksButton
    unlock messages

Toolset/palettes/message box/behaviors/revmessageboxsinglelinecardbehavior.livecodescript

@@ -68,8 +68,8 @@ on layoutCard
    set the rect of field "results" of me to tLeft,(tTop + tHeight),tRight,tBottom
 
    put (tRight - tLeft) into tWidth
-   set the width of graphic "line" to tWidth
-   set the loc of graphic "line" to (tWidth/2),(tTop+tHeight)
+   set the width of graphic "line" of me to tWidth
+   set the loc of graphic "line" of me to (tWidth/2),(tTop+tHeight)
 
    unlock messages
    send "positionOpenStacksButton" to me in 0 milliseconds