DolphinNavigatorsWidgetAction: Let non-Breeze QStyles style the non-toolbar navbar how they wantHEADmaster

Currently when Dolphin's location bar is moved from the main toolbar, it stops being a nice `FrameLineEdit` that QStyles can style as they please.

That's because the current code is only adjusted for Breeze, which wants to fill the entire navbar frame with a plain rectangle.

Unfortunately, non-Breeze styles suffer from bad looks because this Breeze design is applied for them too.

In order to fix this, this MR restores the styling power back to QStyles by removing the rectangle, all the while keeping it for Breeze.

| Before (Breeze) | After (Breeze) |
| ------ | ------ |
|![DolphinURL-before_Breeze_](/uploads/b526076352023862e2f17cef744802a0/DolphinURL-before_Breeze_.png){width=698 height=134}        |  ![DolphinURL-after_Breeze_](/uploads/eb60d5c2a6dff129c4d200fef5f8c5ab/DolphinURL-after_Breeze_.png){width=715 height=138}      |

| Before (Oxygen) | After (Oxygen) |
| ------ | ------ |
|  ![DolphinURL-before_Oxygen_](/uploads/2d8f19debbd5410b8f0882ed20b34f83/DolphinURL-before_Oxygen_.png){width=714 height=114}      | ![DolphinURL-after_Oxygen_](/uploads/fc6a1bed3de647534494951a7b113d5e/DolphinURL-after_Oxygen_.png){width=687 height=129}       |

| Before (MSWindows9x) | After (MSWindows9x) |
| ------ | ------ |
|   ![DolphinURL-before_MSWindows9x_](/uploads/88ebd20a2be5d9052165ea417517b4a3/DolphinURL-before_MSWindows9x_.png){width=715 height=107}     |  ![DolphinURL-after_MSWindows9x_](/uploads/575e7a944238113714c70b7705b3854a/DolphinURL-after_MSWindows9x_.png){width=702 height=100}      |

| Before (Darkly) | After (Darkly) |
| ------ | ------ |
|  ![DolphinURL-before_Darkly_](/uploads/76f28b8175498b6a611953c05554c4e8/DolphinURL-before_Darkly_.png){width=675 height=123}      |  ![DolphinURL-after_Darkly_](/uploads/7b9b15eaab10ee7731d55c60af7591bf/DolphinURL-after_Darkly_.png){width=705 height=144}      |

| Before (Fusion) | After (Fusion) |
| ------ | ------ |
|  ![DolphinURL-before_Fusion_](/uploads/de27a5028986d797407bfe66b2e9916b/DolphinURL-before_Fusion_.png){width=701 height=118}      |   ![DolphinURL-after_Fusion_](/uploads/7f5c7acd1c433fcba8b96e402cf12a21/DolphinURL-after_Fusion_.png){width=692 height=122}     |


| Before (Kvantum) | After (Kvantum) |
| ------ | ------ |
| ![DolphinURL-before_Kvantum](/uploads/21c2126044ba31c3bc00610e34a71ec1/DolphinURL-before_Kvantum.png){width=697 height=135}       |   ![DolphinURL-after_Kvantum](/uploads/ea5287e7ba59e1f9b449c1b002d3b634/DolphinURL-after_Kvantum.png){width=700 height=123}     |

BUG: 518285

FIXED-IN:

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