docs(backend XML): do not delete temp file in notebook

[ceberam]

A small addition for commit 4df08be after remark #788 (comment) from @vagenas

Since TEMP_DIR is anyway defined as temporary directory (i.e. will be removed upon restart), this part can also be dropped for simplicity (and to avoid any accidents with folder deletions..)

[mergify]

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[dolfim-ibm]

lgtm