Bump gocui

... and switch back from stefanhaller's tcell fork to the official tcell. This
basically reverts 7ccb871a45.

vendor/github.com/gdamore/tcell/v2/terms_static.go

@@ -0,0 +1,28 @@
+//go:build tcell_minimal || nacl || zos || plan9 || windows || android || js
+// +build tcell_minimal nacl zos plan9 windows android js
+
+// Copyright 2019 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"errors"
+
+	"github.com/gdamore/tcell/v2/terminfo"
+)
+
+func loadDynamicTerminfo(_ string) (*terminfo.Terminfo, error) {
+	return nil, errors.New("terminal type unsupported")
+}