fix: correct file extension and syntax in rounded-corners toggle

[sridhar-3009]

The rounded-corners toggle file was named rounded-corners.conf but omarchy-hyprland-toggle looks for rounded-corners.lua, causing "Flag not found" and a silent no-op. Additionally the file used plain Hyprland syntax instead of the Lua hl.config() format required by the toggles system.

This renames rounded-corners.conf to rounded-corners.lua and converts its content to the correct Lua module format matching other toggles like window-no-gaps.lua.

Closes #6156

[Copilot]

Pull request overview

Fixes the Hyprland rounded-corners toggle by aligning it with Omarchy’s toggle loader expectations (Lua module files loaded via require_all.files() and selected by omarchy-hyprland-toggle using a hard-coded .lua extension).

Changes:

• Add default/hypr/toggles/rounded-corners.lua using the required hl.config({ ... }) Lua format.
• Remove the old default/hypr/toggles/rounded-corners.conf Hyprland-syntax file that could not be loaded by the toggles system.

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Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
default/hypr/toggles/rounded-corners.lua	Adds the rounded-corners toggle in the correct Lua hl.config() module format.
default/hypr/toggles/rounded-corners.conf	Removes the invalid/non-loadable legacy toggle file.

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