Issue #6627: Failed to open stream: No such file or directory in view…

[alanmels]

…s_plugin_display->options_form()

Fixes https://github.com/backdrop/backdrop-issues/issues/6627

Fixes ISSUE_URL

[backdrop-ci]

Related to: backdrop/backdrop-issues#6627

[dragonbot]

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[alanmels]

LGTM 👍🏼 ...I actually filed the same PR at the same time 😅

Coders think alike :)

[quicksketch]

Thanks @klonos and @alanmels! Merged into 1.x and 1.28.x.