fs: Fix interaction between --progress and --interactive

Before this change if both --progress and --interactive were set then
the screen display could become muddled.

This change makes --progress and --interactive use the same lock so
while rclone is asking for interactive questions, the progress will be
paused.

Fixes #6755

cmd/progress.go

@@ -75,14 +75,13 @@ func startProgress() func() {
 
 // state for the progress printing
 var (
-	nlines     = 0 // number of lines in the previous stats block
-	progressMu sync.Mutex
+	nlines = 0 // number of lines in the previous stats block
 )
 
 // printProgress prints the progress with an optional log
 func printProgress(logMessage string) {
-	progressMu.Lock()
-	defer progressMu.Unlock()
+	operations.StdoutMutex.Lock()
+	defer operations.StdoutMutex.Unlock()
 
 	var buf bytes.Buffer
 	w, _ := terminal.GetSize()