Fix missing images in the test scenario context menu

Both instances refer to the "All" editor palette's icon in 1.10.x, moved
and redrawn during 1.11.x so it doesn't really fit in this menu anymore.
So my logic is, why not put the BLEND() IPF to test?

data/scenario-test.cfg

@@ -3222,7 +3222,7 @@ Result:
         [/set_menu_item]
         [set_menu_item]
             id=test2
-            image="buttons/group_all.png"
+            image="buttons/WML-custom.png~BLEND(255,127,0,1.0)"
             description="Dismiss Troll"
             [show_if]
                 [have_unit]
@@ -3240,7 +3240,7 @@ Result:
         [/set_menu_item]
         [set_menu_item]
             id=terraform
-            image="buttons/group_all.png"
+            image="buttons/WML-custom.png~BLEND(0,255,127,1.0)"
             description="Identify terrain"
             [filter_location]
                 x=4-12