fixup! credential: do not mask the username

As per the consensus on the Git mailing list, let'a drop thia. See
https://public-inbox.org/git/[email protected]

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

credential.c

@@ -136,9 +136,7 @@ static void credential_getpass(struct credential *c)
 {
 	if (!c->username)
 		c->username = credential_ask_one("Username", c,
-						 (getenv("GIT_ASKPASS") ?
-						  PROMPT_ASKPASS : 0) |
-						 PROMPT_ECHO);
+						 PROMPT_ASKPASS|PROMPT_ECHO);
 	if (!c->password)
 		c->password = credential_ask_one("Password", c,
 						 PROMPT_ASKPASS);