Clear fields should automatically check "Overwrite existing field values"

[jorgman1]

Is your suggestion for improvement related to a problem? Please describe.
I wanted to clear some fields in many entries, and it took a couple of tries to figure out that I had to tick "Overwrite existing field values" as well.

Describe the solution you'd like
Either tick the box automatically, or remove it completely. There are four options and all are clear to me: "Set fields" (should overwrite the field), "Append to fields" (should not overwrite), "Rename field to" (should overwrite the name, otherwise I would add an option to copy and change name), "Clear fields" (should delete the field).

Additional context
I noticed, that some of the options are in plural (e.g. "Set fields"). Is it possible to edit several fields simultaneously? This is not clear from the drop-down menu.

[HoussemNasri]

Refs #6536

[jorgman1]

Duplicate