[4.1] Simplify Requirements for Task Routine XMLs

[ditsuke]

Pull Request for Issue #36449.

Summary of Changes

• Fixes form for the Image Size Check task routine and improves a language string for clarity.
• Removes requirement of the "showFront" attribute for the task_params fieldset.

Testing Instructions

• Admin > System > Scheduled Tasks
• Click "Create Task" or similar
• Select "Image Size Check" routine
• Fill in the form and save

Actual result BEFORE applying this Pull Request

• Form fails to submit due to validation error (missing required data).
• Routine XMLs require a showFront="true" attribute.

Expected result AFTER applying this Pull Request

• Form is submitted, task is created.
• Routine XMLs no longer require require the attribute to work correctly.

Documentation Changes Required

-

[Kostelano]

I have tested this item ✅ successfully on 0d0c644

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[Shubhamverma2796]

I have tested this item ✅ successfully on 8cdd8ec

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[jwaisner]

I have tested this item ✅ successfully on 8cdd8ec

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[jwaisner]

RTC

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[ditsuke]

Needs tests again I believe

[Kostelano]

I have tested this item ✅ successfully on 9f11de3

After the changes, everything works.

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[bembelimen]

I have tested this item ✅ successfully on 9f11de3

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[bembelimen]

Thx