Disable user list dismissal if a current user hasn't been selected

[bbirman]

For #3690

Testing enabled vs disabled:

[github-actions]

	1 Warning
⚠️	Static Analysis found an issue with one or more files you modified. Please fix the issue(s).

Clang Static Analysis Issues

File	Type	Category	Description	Line	Col
SFDefaultUserManagementListViewController	Unlocalizable string	Localizability Issue (Apple)	User-facing text should use localized string macro	61	25
SFDefaultUserManagementListViewController	Unlocalizable string	Localizability Issue (Apple)	User-facing text should use localized string macro	63	36
SFDefaultUserManagementListViewController	Unlocalizable string	Localizability Issue (Apple)	User-facing text should use localized string macro	123	30
SFDefaultUserManagementListViewController	Unlocalizable string	Localizability Issue (Apple)	User-facing text should use localized string macro	125	30

Generated by 🚫 Danger

[brandonpage]

Very nice. I'll be sure to remember this when doing the new Android screen next week.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.89%. Comparing base (ca119e9) to head (1af320f).
Report is 16 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ollers/SFDefaultUserManagementListViewController.m	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3814      +/-   ##
==========================================
+ Coverage   61.67%   61.89%   +0.21%     
==========================================
  Files         233      233              
  Lines       21630    21699      +69     
==========================================
+ Hits        13340    13430      +90     
+ Misses       8290     8269      -21     

Components	Coverage Δ
Analytics	81.88% <90.90%> (-2.22%)	⬇️
Common	68.87% <ø> (ø)
Core	50.47% <40.00%> (+0.40%)	⬆️
SmartStore	73.70% <ø> (ø)
MobileSync	87.58% <ø> (ø)

Files with missing lines	Coverage Δ
...ollers/SFDefaultUserManagementListViewController.m	0.00% <0.00%> (ø)

... and 9 files with indirect coverage changes