Fix display issues with execute action

- Move cursor to the top-left corner when starting a command in
  alternate screen
- Fix cursor position when returning to alternate screen when fzf is
  running in full screen mode

src/terminal.go

@@ -1141,6 +1141,7 @@ func (t *Terminal) executeCommand(template string, forcePlus bool, background bo
 		t.tui.Pause()
 		cmd.Run()
 		if t.tui.Resume() {
+			t.tui.Clear()
 			t.printAll()
 		}
 		t.refresh()

src/tui/light.go

@@ -534,6 +534,7 @@ func (r *LightRenderer) Pause() {
 		r.rmcup()
 	} else {
 		r.smcup()
+		r.csi("H")
 	}
 	r.flush()
 }