Use separate PrintToFile.png for the browsers, and Evince.

Since the browsers use a different font, this image will differ from
now on and cannot be shared with Evince.

features/step_definitions/common_steps.rb

@@ -810,7 +810,7 @@ When /^I can print the current page as "([^"]+[.]pdf)" to the (default downloads
   end
   @screen.type("p", Sikuli::KeyModifier.CTRL)
   @screen.wait("TorBrowserPrintDialog.png", 10)
-  @screen.wait_and_click("PrintToFile.png", 10)
+  @screen.wait_and_click("BrowserPrintToFile.png", 10)
   @screen.wait_and_double_click("TorBrowserPrintOutputFile.png", 10)
   @screen.hide_cursor
   @screen.wait("TorBrowserPrintOutputFileSelected.png", 10)

features/step_definitions/evince.rb

@@ -5,7 +5,7 @@ end
 Then /^I can print the current document to "([^"]+)"$/ do |output_file|
   @screen.type("p", Sikuli::KeyModifier.CTRL)
   @screen.wait("EvincePrintDialog.png", 10)
-  @screen.wait_and_click("PrintToFile.png", 10)
+  @screen.wait_and_click("EvincePrintToFile.png", 10)
   @screen.wait_and_click("EvincePrintOutputFileButton.png", 10)
   @screen.wait("EvincePrintFileDialog.png", 10)
   # Only the file's basename is selected by double-clicking,