search/chip: Draw chip with QStyle instead of hardcoding Breeze

Currently the code for the Dolphin chip, that gets used for filters with file indexing, is hardcoding Breeze.

We want it to support other styles too, all the while retaining the desired appearance for Breeze.

The port to use the `FrameLineEdit` accomplishes that. The results are that:

- Non-Breeze themes now get to style the chip properly
- the code is cleaner
- Breeze even looks better since there is no more of this hover glitch:

![image](/uploads/03707ad2e76cf702757c2e66ab49be34/image.png){width=173 height=72}

| Breeze before | Breeze after |
| ------ | ------ |
|  ![Dolphin-searchChip_Breeze-before_](/uploads/ef2809514e973ce5306ce78aca127cb9/Dolphin-searchChip_Breeze-before_.png){width=613 height=120}      |   ![Dolphin-searchChip_Breeze-after_](/uploads/ce0bcdc4ac766255e3d06627b9740085/Dolphin-searchChip_Breeze-after_.png){width=642 height=139}     |

| Oxygen before | Oxygen after |
| ------ | ------ |
|  ![Dolphin-searchChip_Oxygen-before_](/uploads/0b32b7a6d7849a13f46ed0e9a8c10b38/Dolphin-searchChip_Oxygen-before_.png){width=616 height=106}      |   ![Dolphin-searchChip_Oxygen-after_](/uploads/9fbce947e0c65726ddc118217ac34884/Dolphin-searchChip_Oxygen-after_.png){width=621 height=103}     |

| MSWindows9x before | MSWindows9x after |
| ------ | ------ |
|  ![Dolphin-searchChip_MSWindows-before_](/uploads/c8b7823f74de708e95eef8380eafb231/Dolphin-searchChip_MSWindows-before_.png){width=618 height=99}      |  ![Dolphin-searchChip_MSWindows-after_](/uploads/d1f1d390ffabbc21e3d734c7816b4fd0/Dolphin-searchChip_MSWindows-after_.png){width=606 height=89}      |

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