Fix can't modify frozen String error in display_image
#30417
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Without this, `display_image` raises an error as follwing:
```
RuntimeError: can't modify frozen String
rails/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb:72:in `display_image'
rails/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb:40:in `block (2 levels) in <class:ScreenshotHelperTest>'
```
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y-yagi
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fix_cant_modify_forzen_string_error_in_display_image
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Without this,
display_imageraises an error as follwing: