Auth dialog webOS-ified, various small layout fixes + search working again

You cannot do styling on a placeholder it seems ;) Anyway this was here 
from the original author, just reworked it a bit.

On 22.09.2014 12:56, Tofee wrote:
> In qml/AuthenticationDialog.qml:
> 
>> + color: "black"
>> + onActiveFocusChanged: {
>> + if (password.activeFocus) {
>> + passwordBG.visible = true
>> + } else {
>> + passwordBG.visible = false
>> + }
>> + }
>> +
>> + onTextChanged: {
>> + if (password.length > 0) {
>> + passwordHint.visible = false
>> + } else {
>> + passwordHint.visible = true
>> + }
>> + }
> 
> Have you tried using the QtQuick.Control TextField component ? It has
> a "placeholder" property, doing exactly what you are manually doing
> here
> 
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> Links:
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> [1]
> https://github.com/webOS-ports/org.webosports.app.browser/pull/14/files#r17842521