Fix importing

[VMelnalksnis]

Fixes #741

Changes proposed in this pull request:

• Fix requisition selection in Nordigen integration tests
• Fix sign of amount for the other account besides the users' when importing from Nordigen
• Fix issue finding an existing account by name when IBAN is not specified when importing transactions

[codecov]

Codecov Report

Merging #742 (b093b37) into master (b269df4) will increase coverage by 0.02%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master     #742      +/-   ##
==========================================
+ Coverage   77.01%   77.04%   +0.02%     
==========================================
  Files         225      225              
  Lines        6292     6298       +6     
==========================================
+ Hits         4846     4852       +6     
  Misses       1446     1446              

Impacted Files	Coverage Δ
...de.WebApi/V1/Importing/TransactionImportService.cs	90.68% <0.00%> (ø)
...eshade.WebApi/V1/Controllers/NordigenController.cs	85.88% <90.90%> (+0.53%)	⬆️

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