core: Remove unused includes

src/core/frontend/applets/general_frontend.h

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <functional>
-#include <optional>
 #include "common/common_types.h"
 
 namespace Core::Frontend {

src/core/frontend/applets/software_keyboard.h

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <functional>
-#include <thread>
 
 #include "common/common_types.h"
 

src/core/frontend/applets/web_browser.h

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <functional>
-#include <string_view>
 
 #include "core/hle/service/am/applets/applet_web_browser_types.h"
 

src/core/frontend/emu_window.cpp

@@ -2,7 +2,6 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <cmath>
 #include <mutex>
 #include "common/settings.h"
 #include "core/frontend/emu_window.h"

src/core/frontend/emu_window.h

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <memory>
-#include <tuple>
 #include <utility>
 #include "common/common_types.h"
 #include "core/frontend/framebuffer_layout.h"