Revert "vendor: update x/crypto/ssh - to fix Windows password length issues fixes #3798"

This turned out to introduce a regression, not being able to press Enter.

See: #3888 and https://github.com/golang/go/issues/36609

This reverts commit 251cfc100e.

vendor/golang.org/x/crypto/ssh/terminal/terminal.go

@@ -947,10 +947,6 @@ func readPasswordLine(reader io.Reader) ([]byte, error) {
 		n, err := reader.Read(buf[:])
 		if n > 0 {
 			switch buf[0] {
-			case '\b':
-				if len(ret) > 0 {
-					ret = ret[:len(ret)-1]
-				}
 			case '\n':
 				return ret, nil
 			case '\r':

vendor/golang.org/x/crypto/ssh/terminal/util_windows.go

@@ -85,8 +85,8 @@ func ReadPassword(fd int) ([]byte, error) {
 	}
 	old := st
 
-	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
-	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
+	st &^= (windows.ENABLE_ECHO_INPUT)
+	st |= (windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
 	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
 		return nil, err
 	}

vendor/modules.txt

@@ -203,7 +203,7 @@ go.opencensus.io/trace/propagation
 go.opencensus.io/trace/tracestate
 # goftp.io/server v0.0.0-20190812052725-72a57b186803
 goftp.io/server
-# golang.org/x/crypto v0.0.0-20200117160349-530e935923ad
+# golang.org/x/crypto v0.0.0-20200109152110-61a87790db17
 golang.org/x/crypto/bcrypt
 golang.org/x/crypto/blowfish
 golang.org/x/crypto/chacha20