Fix issue #3308 (#3478)

- **PR Description**

It seems that setting TERM=dumb breaks compatibility with curses
subprocess in Go, especially with `pinentry-curses`

This fixes #3308

pkg/commands/oscommands/cmd_obj_runner.go

@@ -220,9 +220,6 @@ func (self *cmdObjRunner) runAndStreamAux(
 	cmdObj ICmdObj,
 	onRun func(*cmdHandler, io.Writer),
 ) error {
-	// if we're streaming this we don't want any fancy terminal stuff
-	cmdObj.AddEnvVars("TERM=dumb")
-
 	cmdWriter := self.guiIO.newCmdWriterFn()
 
 	if cmdObj.ShouldLog() {