Description:
UserFieldsMgr-L-0.9.3: Export to CSV function ignores the 'Other' separation character when it is defined.

Error can be demonstrated as follows:


Steps to Reproduce:
1. $ lowriter (or open Writer via GNU.)
2. Select Tools/Add-Ons/UserFieldsMgr.
3. Enter 'Test_Field_Name' in 'Name' of 'Masterfield item', click 'Add'.
   Enter 'Test_Field_Value' in 'Value' of 'Masterfield item', click 'Update'.
   Enter 'Test_Field_Name2' in 'Name' of 'Masterfield item', click 'Add'.
   Enter 'Test_Field_Value2' in 'Value' of 'Masterfield item', click 'Update'.
4. Click 'Other' in 'Export to CSV'.  
4.1 Enter '|' in the 'Other' textbox.
4.2 Click 'Export...'
4.3 Enter a file path. E.g., '~/Desktop/UserFields.csv' and click 'Save'.
4.4 Click OK in Information Dialog 
        'Process ended successfully: 
        2 fields exported to the UserFields.csv 
        (unfiltered)'.
5.1 Click drop-down arrow next to the 'Other' textbox and click ';' to select.
5.2 Click 'Export...'
5.3 Enter a file path. E.g., '~/Desktop/UserFields2.csv' and click 'Save'.
5.4 Click OK in Information Dialog.
6.  From outside of Writer, examine contents of:
        ~/Desktop/UserFields.csv and 
        ~/Desktop/UserFields2.csv
    Both CSV files contain the identical tab-delimited content. 


Actual Results:
Test_Field_Name Test_Field_Value
Test_Field_Name2        Test_Field_Value2


Expected Results:
Test_Field_Name|Test_Field_Value
Test_Field_Name2|Test_Field_Value2



Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: TextDocument
[Information guessed from browser]
OS: Linux (All)
OS is 64bit: yes
---
Version: 7.0.3.1
Build ID: 00(Build:1)
CPU threads: 4; OS: Linux 5.8; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Ubuntu package version: 1:7.0.3-0ubuntu0.20.10.1
Calc: threaded