Revert "cheggaaa.pb: try to not open tty at init to see if it causes #7299"

This reverts commit 4e55278839.

vendor/github.com/cheggaaa/pb/pb_x.go

@@ -24,16 +24,16 @@ var (
 )
 
 func init() {
-	// echoLockMutex.Lock()
-	// defer echoLockMutex.Unlock()
+	echoLockMutex.Lock()
+	defer echoLockMutex.Unlock()
 
-	// var err error
-	// tty, err = os.Open("/dev/tty")
-	// istty = true
-	// if err != nil {
-	// 	tty = os.Stdin
-	// 	istty = false
-	// }
+	var err error
+	tty, err = os.Open("/dev/tty")
+	istty = true
+	if err != nil {
+		tty = os.Stdin
+		istty = false
+	}
 }
 
 // terminalWidth returns width of the terminal.