Switching contact import to finish in background causes 500

[nick-vanpraet]

Q	A
Bug fix? (use the a.b branch)	[ x ]
New feature/enhancement? (use the a.x branch)	[ ]
Deprecations?	[ ]
BC breaks? (use the c.x branch)	[ ]
Automated tests included?	[ ]
Related user documentation PR URL	mautic/mautic-documentation#...
Related developer documentation PR URL	mautic/developer-documentation#...
Issue(s) addressed	Fixes #...

Description:

When starting a contact import via the web browser, and then you click "finish in background", a 500 error occurs. This is because of an extra $ that snuck in a while back.

Steps to test this PR:

1. Open this PR on Gitpod or pull down for testing locally (see docs on testing PRs here)
2. Import contacts via CSV, make sure there's enough that it takes a while
3. Hit "finish in background". Should no longer 500 in network tab

[nick-vanpraet]

This was already fixed for 5.x btw

[codecov]

Codecov Report

Merging #12538 (bed041e) into 4.4 (8e728f2) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                4.4   #12538      +/-   ##
============================================
- Coverage     50.28%   50.28%   -0.01%     
  Complexity    35447    35447              
============================================
  Files          2145     2145              
  Lines        106426   106426              
============================================
- Hits          53513    53512       -1     
- Misses        52913    52914       +1     

Impacted Files	Coverage Δ
...bundles/LeadBundle/Controller/ImportController.php	59.55% <0.00%> (-0.32%)	⬇️

[escopecz]

Thanks! 👍