copy_params: use constexpr for constructor

src/video_core/texture_cache/copy_params.h

@@ -9,13 +9,14 @@
 namespace VideoCommon {
 
 struct CopyParams {
-    CopyParams(u32 source_x, u32 source_y, u32 source_z, u32 dest_x, u32 dest_y, u32 dest_z,
-               u32 source_level, u32 dest_level, u32 width, u32 height, u32 depth)
+    constexpr CopyParams(u32 source_x, u32 source_y, u32 source_z, u32 dest_x, u32 dest_y,
+                         u32 dest_z, u32 source_level, u32 dest_level, u32 width, u32 height,
+                         u32 depth)
         : source_x{source_x}, source_y{source_y}, source_z{source_z}, dest_x{dest_x},
           dest_y{dest_y}, dest_z{dest_z}, source_level{source_level},
           dest_level{dest_level}, width{width}, height{height}, depth{depth} {}
 
-    CopyParams(u32 width, u32 height, u32 depth, u32 level)
+    constexpr CopyParams(u32 width, u32 height, u32 depth, u32 level)
         : source_x{}, source_y{}, source_z{}, dest_x{}, dest_y{}, dest_z{}, source_level{level},
           dest_level{level}, width{width}, height{height}, depth{depth} {}