Improve PasswordActivity by

* removing screen border visible on small screens
* showing noticeable error message on wrong password input
* showing keyboard again after entering wrong password
* making lost password link easier to recognize as link
* renaming keyboard toggle method from 'hide' to 'toggle'

briar-android/src/org/briarproject/android/identity/CreateIdentityActivity.java

@@ -118,7 +118,7 @@ implements OnEditorActionListener, OnClickListener {
 	}
 
 	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
-		hideSoftKeyboard();
+		toggleSoftKeyboard();
 		return true;
 	}
 
@@ -134,7 +134,7 @@ implements OnEditorActionListener, OnClickListener {
 	}
 
 	public void onClick(View view) {
-		hideSoftKeyboard();
+		toggleSoftKeyboard();
 		if (!validateNickname()) return;
 		// Replace the button with a progress bar
 		createIdentityButton.setVisibility(GONE);