change reported line number for errors

[christianhanvey]

When there's an error with column count, the reported line the error is on is actually one less than the actual error. I guess this is because the rows are counted from the actual import data, and don't include the header row - but as files/raw data always require a header row, why not report the actual line?

Sample output below, where the actual error is on line 9, it is reported as on line 8:

Console running...
Attempted to set execution time to infinite. Max execution time currently: infinite.
Running pre-import tests on submitted data...
Data file upload overriding any manual input. Filename: products.txt
No errors in pre-import found. Preparing import values...
Error: Element count do not match. Please check for correct syntax on line 8

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