Fix constant resolution in layout CLI option

features/cli/layout.feature

@@ -9,3 +9,7 @@ Feature: layout CLI option
       """
     When I run uhwm with option -v -r./layout -l MyLayout
     Then the output must match /layout.+mylayout/i
+
+  Scenario: resolves layout class from the root namespace
+    When I run uhwm with option -v -l Layout
+    Then the output must contain "uninitialized constant Layout"

lib/uh/wm/cli.rb

@@ -68,7 +68,7 @@ module Uh
             log "Loaded `#{feature}' ruby feature"
           end
           opts.on '-l', '--layout LAYOUT', 'specify layout' do |layout|
-            @env.layout_class = self.class.const_get layout.to_sym
+            @env.layout_class = Object.const_get layout.to_sym
           end
           opts.on '-w', Workers.types, '--worker WORKER',
               'specify worker' do |worker|