chore(test-hyprland): remove unused IPC test fixture

The hyprland IPC fixture was no longer used by the current test setup.

I removed the dead fixture so the test code reflects the actual execution path
and is easier to maintain.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

test/hyprland/fixtures/IPCTestFixture.hpp

@@ -1,25 +0,0 @@
-#include "modules/hyprland/backend.hpp"
-
-namespace fs = std::filesystem;
-namespace hyprland = waybar::modules::hyprland;
-
-class IPCTestFixture : public hyprland::IPC {
- public:
-  IPCTestFixture() : IPC() { IPC::socketFolder_ = ""; }
-  ~IPCTestFixture() { fs::remove_all(tempDir); }
-
- protected:
-  const char* instanceSig = "instance_sig";
-  fs::path tempDir = fs::temp_directory_path() / "hypr_test";
-
- private:
-};
-
-class IPCMock : public IPCTestFixture {
- public:
-  // Mock getSocket1Reply to return an empty string
-  static std::string getSocket1Reply(const std::string& rq) { return ""; }
-
- protected:
-  const char* instanceSig = "instance_sig";
-};