Fix build_uncolorized_expected_output

Author: mcmire

lib/super_diff/csi/uncolorized_document.rb

@@ -20,7 +20,7 @@ def colorize_inline(contents, *)
       end
 
       def add_part(part)
-        if !part.is_a?(ResetSequence) && part.is_a?(ColorSequenceBlock)
+        if !part.is_a?(ResetSequence) && !part.is_a?(ColorSequenceBlock)
           super
         end
       end

spec/integration/rspec_spec.rb

@@ -2397,7 +2397,7 @@
 
     context "if color has been disabled" do
       it "does not include the color in the output" do
-        program = make_plain_test_program(<<~TEST, color_enabled: true)
+        program = make_plain_test_program(<<~TEST, color_enabled: false)
           expect(double).to respond_to(:foo)
         TEST