Don't include a message when calling password::prompt_to_unlock.

- `password::prompt_to_unlock` takes a description of the item to
    unlock, not a full password prompt.

  - Fix the prompts.

src/common/key/password.rs

@@ -144,8 +144,7 @@ pub fn password(sq: Sq,
 
                     loop {
                         let p = password::prompt_to_unlock(&format!(
-                            "Please enter the password to decrypt \
-                             the key {}/{}, {}",
+                            "{}/{}, {}",
                             cert.keyid(), ka.keyid(), uid))?;
 
                         match key.unlock(p.clone()) {

src/sq.rs

@@ -1271,8 +1271,7 @@ impl<'store: 'rstore, 'rstore> Sq<'store, 'rstore> {
 
                         loop {
                             let p = password::prompt_to_unlock(&format!(
-                                "Please enter the password to decrypt \
-                                 the key {}/{}, {}",
+                                "{}/{}, {}",
                                 ka.cert().keyid(), ka.keyid(), uid))?;
 
                             if p == "".into() {