Display correct splash color on web export

misc/dist/html/full-size.html

@@ -38,7 +38,7 @@ body {
 }
 
 #status {
-	background-color: #242424;
+	background-color: $GODOT_SPLASH_COLOR;
 	display: flex;
 	flex-direction: column;
 	justify-content: center;

platform/web/export/export_plugin.cpp

@@ -169,6 +169,7 @@ void EditorExportPlatformWeb::_fix_html(Vector<uint8_t> &p_html, const Ref<Edito
 	replaces["$GODOT_PROJECT_NAME"] = GLOBAL_GET("application/config/name");
 	replaces["$GODOT_HEAD_INCLUDE"] = head_include + custom_head_include;
 	replaces["$GODOT_CONFIG"] = str_config;
+	replaces["$GODOT_SPLASH_COLOR"] = "#" + Color(GLOBAL_GET("application/boot_splash/bg_color")).to_html(false);
 	replaces["$GODOT_SPLASH"] = p_name + ".png";
 
 	if (p_preset->get("variant/thread_support")) {