QML UI: remove "show password" switch and only show pw on first entry

Like the subject says. We do not want the password to be made
visible, so a switch to show it, is useless and is therefore
removed. Futher, the entry mode is set to PasswordEchoOnEdit,
which causes the passwd to be visible (for easy entry), but
can't be made visible again after save/end edit.

Fixes: #512

Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>

mobile-widgets/qml/CloudCredentials.qml

@@ -79,7 +79,7 @@ Item {
 		TextField {
 			id: password
 			text: manager.cloudPassword
-			echoMode: TextInput.Password
+			echoMode: TextInput.PasswordEchoOnEdit
 			inputMethodHints: Qt.ImhSensitiveData |
 					  Qt.ImhHiddenText |
 					  Qt.ImhNoAutoUppercase
@@ -89,25 +89,6 @@ Item {
 			}
 		}
 
-		GridLayout {
-			columns: 2
-
-			Kirigami.Label {
-				text: qsTr("Show password")
-				Layout.preferredWidth: col1Width
-			}
-			SsrfSwitch {
-				checked: false
-				id: showPassword
-				Layout.preferredWidth: col2Width
-				onCheckedChanged: {
-					if (checked)
-						password.text = "" // don't show a hidden password
-					password.echoMode = checked ? TextInput.Normal : TextInput.Password
-				}
-			}
-		}
-
 		Kirigami.Label {
 			text: qsTr("PIN")
 			visible: rootItem.showPin