System should ignore spaces before line indexes on GenBank/GenPept sequences import

[AlexeyGirin]

Steps to Reproduce

1. Go to Macro - Sequence mode <--- Important
2. Load following Sequence: GenBank-example.zip
   
   It is taken from https://www.ncbi.nlm.nih.gov/genbank/samplerecord/

Actual behavior
System throws exception: Convert error! Given string could not be loaded as (query or plain) molecule or reaction, see the error messages: 'SEQUENCE loader: Invalid symbols in the sequence: 1,6,1,1,2,1,1,8,1,2,4,1,3,0,1,3,6,1,4,2,1,4,8,1,5,4,1,6,0,1,6,6,1,7,2,1,7,8,1,8,4,1,9,0,1,9,6,1,1,0,2,1,1,0,8,1,1,1,4,1,1,2,0,1,1,2,6,1,1,3,2,1,1,3,8,1,1,4,4,1,1,5,0,1,1,5,6,1,1,6,2,1,1,6,8,1,1,7,4,1,1,8,0,1,1,8,6,1,1,9,2,1,1,9,8,1,2,0,4,1,2,1,0,1,2,1,6,1,2,2,2,1,2,2,8,1,2,3,4,1,2,4,0,1,2,4,6,1,2,5,2,1,2,5,8,1,2,6,4,1,2,7,0,1,2,7,6,1,2,8,2,1,2,8,8,1,2,9,4,1,3,0,0,1,3,0,6,1,3,1,2,1,3,1,8,1,3,2,4,1,3,3,0,1,3,3,6,1,3,4,2,1,3,4,8,1,3,5,4,1,3,6,0,1,3,6,6,1,3,7,2,1,3,7,8,1,3,8,4,1,3,9,0,1,3,9,6,1,4,0,2,1,4,0,8,1,4,1,4,1,4,2,0,1,4,2,6,1,4,3,2,1,4,3,8,1,4,4,4,1,4,5,0,1,4,5,6,1,4,6,2,1,4,6,8,1,4,7,4,1,4,8,0,1,4,8,6,1,4,9,2,1,4,9,8,1'

Expected behavior
No exception, contend loaded

Versions

• Ketcher Version 3.1.0-rc.3 Build at 2025-02-11; 20:29:49
• Indigo Version 1.29.0-rc.1.0-g2e30df8f7-wasm32-wasm-clang-19.0.0
• Chrome Version 133.0.6943.60 (Official Build) (64-bit)
• Win10

Issue found while testing - #1844