tests: Add the cursor and focus colors to the generated images theme.

tests/examples/shims/beautiful.lua

@@ -29,10 +29,13 @@ end
 local module = {
     fg_normal    = "#000000"  ,
     bg_normal    = "#6181FF7D",
+    bg_focus     = "#AA00FF7D",
     bg_highlight = "#AA00FF7D",
     border_color = "#6181FF"  ,
     border_width = 1.5        ,
 
+    prompt_bg_cursor = "#00FF7D",
+
     -- Fake resources handling
     xresources = require("beautiful.xresources"),