default_ini: Split and concatenate the config string literal

We are dangerously close to MSVC's 16384 character limit for string literals. Breaking this string up and concatenating will allow for more settings to be added in the future.

src/yuzu_cmd/default_ini.h

@@ -5,8 +5,8 @@
 
 namespace DefaultINI {
 
-const char* sdl2_config_file = R"(
-
+const char* sdl2_config_file =
+    R"(
 [ControlsP0]
 # The input devices and parameters for each Switch native input
 # The config section determines the player number where the config will be applied on. For example "ControlsP0", "ControlsP1", ...
@@ -143,6 +143,8 @@ mouse_enabled =
 # 0 (default): Disabled, 1: Enabled
 keyboard_enabled =
 
+)"
+    R"(
 [Core]
 # Whether to use multi-core for CPU emulation
 # 0: Disabled, 1 (default): Enabled
@@ -242,6 +244,8 @@ cpuopt_unsafe_fastmem_check =
 # 0: Disabled, 1 (default): Enabled
 cpuopt_unsafe_ignore_global_monitor =
 
+)"
+    R"(
 [Renderer]
 # Which backend API to use.
 # 0: OpenGL, 1 (default): Vulkan
@@ -360,6 +364,8 @@ bg_red =
 bg_blue =
 bg_green =
 
+)"
+    R"(
 [Audio]
 # Which audio output engine to use.
 # auto (default): Auto-select