Square- and BorderIndicator now use trigger data for changing color

If the field color is supplied from trigger data, these indicators will
now change their color. Currently this change is permanent and not bound to the
trigger.

src/types/indicators/borderindicator.lua

@@ -70,10 +70,20 @@ end
 --- Show the square indicator.
 ---@param data table
 function BorderIndicator:Show(data)
+    if data.color then
+        self.color = data.color
+    end
     local frame, stacks = self:GetFrame()
     frame:Show()
 end
 
+
+function BorderIndicator:Update(data)
+    if data.color then
+        self:SetColor(data.color)
+    end
+end
+
 function BorderIndicator:GetFrame()
     local frame, new = borderPool:Acquire()
     if new then

src/types/indicators/squareindicator.lua

@@ -77,7 +77,11 @@ function SquareIndicator:Show(data)
         stacks:SetText(numStacks)
         stacks:Show()
     end
-    frame:SetBackdropColor(unpack(self.color))
+    if data.color then
+        self:SetColor(data.color)
+    else
+        frame:SetBackdropColor(unpack(self.color))
+    end
     frame:Show()
 end
 
@@ -110,6 +114,9 @@ end
 
 ---@param data table
 function SquareIndicator:Update(data)
+    if data.color then
+        self:SetColor(data.color)
+    end
     local numStacks = data.stacks or 0
     if numStacks > 0 then
         self.stacks:SetText(numStacks)