Name NLB uploads izpisek_YYYY-MM-DD

Back to the dashed date rename_izpiski.py used, so a statement the script
already named is recognised as already there when it is uploaded again,
rather than landing as a second copy under the underscored name.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/parser/nlb.go

@@ -65,7 +65,7 @@ func (p *nlbParser) Parse(path string, acc *config.Account) ([]RawTxn, error) {
 	return parseNLBText(text, p.digits)
 }
 
-// StatementName names an izpisek after its statement date, izpisek_YYYY_MM_DD,
+// StatementName names an izpisek after its statement date, izpisek_YYYY-MM-DD,
 // so the folder sorts by date and two downloads of one statement collide.
 func (p *nlbParser) StatementName(path string) (string, error) {
 	text, err := pdfToText(path)
@@ -80,7 +80,7 @@ func nlbStatementName(text string) string {
 	if m == nil {
 		return ""
 	}
-	return fmt.Sprintf("izpisek_%s_%s_%s", m[3], m[2], m[1])
+	return fmt.Sprintf("izpisek_%s-%s-%s", m[3], m[2], m[1])
 }
 
 // parseNLBText holds the whole parser, separated from PDF extraction so it can