Submission RPC fails due to a change with the display_errors setting.

[lfield]

Describe the bug

The RPC command cmd=batch_files from get_output.php fails with the 1.4.7 release.
The client receives the error "zipfile.BadZipFile: File is not a zip file" due to the file containing a HTML response. e.g.

<br />
<b>Warning</b>:  filesize(): stat failed for /boincdata/boinc/project/lhcathome/html/cache/boinc_batch_gzCHsF.zip in <b>/boincdata/boinc/project/lhcathome/html/inc/util.inc</b> on line <b>1092</b><br />
<br />
<b>Warning</b>:  readfile(/boincdata/boinc/project/lhcathome/html/cache/boinc_batch_gzCHsF.zip): Failed to open stream: No such file or directory in <b>/boincdata/boinc/project/lhcathome/html/inc/util.inc</b> on line <b>1094</b><br />
<br />
<b>Warning</b>:  unlink(/boincdata/boinc/project/lhcathome/html/cache/boinc_batch_gzCHsF.zip): No such file or directory in <b>/boincdata/boinc/project/lhcathome/html/user/get_output.php</b> on line <b>118</b><br />

This issue seems to be caused by the setting ini_set('display_errors', true); in util.inc

Steps to reproduce

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Expected behavior

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Screenshots

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System information

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Additional context

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