Windows: Restore console mode on set mode failure

SetConsoleMode() on input handles appears to remember invalid bits that
were set, causing problems for other programs (such as xcopy.exe) trying
to set the console mode after docker.exe has exited. Always restore
the input console mode on set failure.

Signed-off-by: John Starks <jostarks@microsoft.com>
(cherry picked from commit 83c186fdd4332b8a08db715e8cb5dd1e80a56567)
Signed-off-by: Tibor Vass <tibor@docker.com>

pkg/term/term_windows.go

@@ -44,9 +44,11 @@ func StdStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
 		if err = winterm.SetConsoleMode(fd, mode|enableVirtualTerminalInput); err != nil {
 			emulateStdin = true
 		} else {
-			winterm.SetConsoleMode(fd, mode)
 			vtInputSupported = true
 		}
+		// Unconditionally set the console mode back even on failure because SetConsoleMode
+		// remembers invalid bits on input handles.
+		winterm.SetConsoleMode(fd, mode)
 	}
 
 	fd = os.Stdout.Fd()