If inline_label opt is true use default label text

Have the inline label text be set to the default
label text if the inline_label config is true.

lib/simple_form/inputs/boolean_input.rb

@@ -3,9 +3,12 @@ module SimpleForm
     class BooleanInput < Base
       def input
         if nested_boolean_style?
+          # If the inline_label option is a set to true then use the label_text as the inline_label
+          # otherwise use the specified object as the inline label (could be nil).
+          inline_label = options[:inline_label].eql?(true) ? label_text : options[:inline_label]
           build_hidden_field_for_checkbox +
             template.label_tag(nil, :class => "checkbox") {
-              build_check_box_without_hidden_field + options[:inline_label]
+              build_check_box_without_hidden_field + inline_label
             }
         else
           build_check_box

test/inputs/boolean_input_test.rb

@@ -36,6 +36,13 @@ class BooleanInputTest < ActionView::TestCase
     end
   end
 
+  test 'input boolean with nested style creates an inline label using the default label text when inline_label option set to true' do
+    swap SimpleForm, :boolean_style => :nested do
+      with_input_for @user, :active, :boolean, :label => false, :inline_label => true
+      assert_select 'label.checkbox', :text => 'Active'
+    end
+  end
+
   test 'input boolean with nested generates a manual hidden field for checkbox outside the label, to recreate Rails functionality with valid html5' do
     swap SimpleForm, :boolean_style => :nested do
       with_input_for @user, :active, :boolean