fix: respect square thumbnail style in list view

[MiMoHo]

Type of change(s)

• Bug fix

What changed and why

List-view thumbnails always rendered with rounded corners even when the user selected the square thumbnail style, while grid view respected the setting. In both MediaAdapter and DirectoryAdapter, the roundedCorners when evaluated the isListViewType branch first, so list view unconditionally forced ROUNDED_CORNERS_SMALL and never consulted the square setting (config.fileRoundedCorners == false for media, folderStyle == FOLDER_STYLE_SQUARE for folders).

The fix reorders the branches so the square-style check runs first. When the user picks square, thumbnails now get ROUNDED_CORNERS_NONE in both list and grid views; otherwise the previous behavior is preserved (list = small radius, grid = big radius). This is a minimal, behavior-preserving reorder with no layout or resource changes.

Tests performed

Built the fossDebug variant and verified on an Android 15 (API 35) emulator:

Seeded 5 images; set File thumbnail style=Square (rounded off), switched folder to List view -> thumbnails square-cornered; changed style to Rounded corners -> List view thumbnails rounded. Style now respected in list view. Folder thumbnails also square in grid (Folder style=Square).

Also confirmed detekt, lint, unit tests and the build all pass locally (CI-equivalent).

Closes the following issue(s)

• Closes Thumbnails in list view mode have rounded corners when they are set to square #589

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator.
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• I understand every change in this pull request.

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