emu_window: Return pair from ClipToTouchScreen() instead of tuple

This is only a 2-tuple, so it can be converted over to the std::pair
class.

src/core/frontend/emu_window.cpp

@@ -66,14 +66,14 @@ static bool IsWithinTouchscreen(const Layout::FramebufferLayout& layout, u32 fra
             framebuffer_x >= layout.screen.left && framebuffer_x < layout.screen.right);
 }
 
-std::tuple<u32, u32> EmuWindow::ClipToTouchScreen(u32 new_x, u32 new_y) const {
+std::pair<u32, u32> EmuWindow::ClipToTouchScreen(u32 new_x, u32 new_y) const {
     new_x = std::max(new_x, framebuffer_layout.screen.left);
     new_x = std::min(new_x, framebuffer_layout.screen.right - 1);
 
     new_y = std::max(new_y, framebuffer_layout.screen.top);
     new_y = std::min(new_y, framebuffer_layout.screen.bottom - 1);
 
-    return std::make_tuple(new_x, new_y);
+    return std::make_pair(new_x, new_y);
 }
 
 void EmuWindow::TouchPressed(u32 framebuffer_x, u32 framebuffer_y, size_t id) {
@@ -107,11 +107,14 @@ void EmuWindow::TouchMoved(u32 framebuffer_x, u32 framebuffer_y, size_t id) {
     if (id >= touch_state->status.size()) {
         return;
     }
-    if (!std::get<2>(touch_state->status[id]))
+
+    if (!std::get<2>(touch_state->status[id])) {
         return;
+    }
 
-    if (!IsWithinTouchscreen(framebuffer_layout, framebuffer_x, framebuffer_y))
+    if (!IsWithinTouchscreen(framebuffer_layout, framebuffer_x, framebuffer_y)) {
         std::tie(framebuffer_x, framebuffer_y) = ClipToTouchScreen(framebuffer_x, framebuffer_y);
+    }
 
     TouchPressed(framebuffer_x, framebuffer_y, id);
 }

src/core/frontend/emu_window.h

@@ -228,7 +228,7 @@ private:
     /**
      * Clip the provided coordinates to be inside the touchscreen area.
      */
-    std::tuple<u32, u32> ClipToTouchScreen(u32 new_x, u32 new_y) const;
+    std::pair<u32, u32> ClipToTouchScreen(u32 new_x, u32 new_y) const;
 
     Layout::FramebufferLayout framebuffer_layout; ///< Current framebuffer layout