backup: fix stuck status bar

The status bar got stuck once the first error was reported, the scanner
completed or some file was backed up. Either case sets a flag that the
scanner has started.

This flag is used to hide the progress bar until the flag is set. Due to
an inverted condition, the opposite happened and the status stopped
refreshing once the flag was set.

In addition, the scannerStarted flag was not set when the scanner just
reported progress information.

internal/ui/backup/progress.go

@@ -102,7 +102,7 @@ func (p *Progress) Run(ctx context.Context) {
 		}
 
 		p.mu.Lock()
-		if p.scanStarted {
+		if !p.scanStarted {
 			p.mu.Unlock()
 			continue
 		}
@@ -231,11 +231,10 @@ func (p *Progress) ReportTotal(item string, s archiver.ScanStats) {
 	defer p.mu.Unlock()
 
 	p.total = Counter{Files: uint64(s.Files), Dirs: uint64(s.Dirs), Bytes: s.Bytes}
+	p.scanStarted = true
 
 	if item == "" {
 		p.printer.ReportTotal(item, p.start, s)
-		p.scanStarted = true
-		return
 	}
 }