Add the street background.

inc/map/map.street.lua

@@ -0,0 +1,9 @@
+Map.register({
+  id = "street",
+  from_x =  30,
+  from_y =  0,
+  width  = 30,
+  height = 17,
+  to_x   =  0,
+  to_y   =  0,
+})

inc/screen/screen.walking_to_home.lua

@@ -1,9 +1,9 @@
 Screen.register({
   id = "walking_to_home",
   name = "Walking to home",
-  background_color = Config.colors.dark_grey,
   decisions = {
     "go_to_home",
     "go_to_office",
-  }
+  },
+  background = "street"
 })

inc/screen/screen.walking_to_office.lua

@@ -1,9 +1,9 @@
 Screen.register({
   id = "walking_to_office",
   name = "Walking to office",
-  background_color = Config.colors.dark_grey,
   decisions = {
     "go_to_home",
     "go_to_office",
-  }
+  },
+  background = "street"
 })