Style: Enforce braces around if blocks and loops

Using clang-tidy's `readability-braces-around-statements`.
https://clang.llvm.org/extra/clang-tidy/checks/readability-braces-around-statements.html

modules/bmp/image_loader_bmp.cpp

@@ -37,8 +37,9 @@ Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
 		const bmp_header_s &p_header) {
 	Error err = OK;
 
-	if (p_buffer == nullptr)
+	if (p_buffer == nullptr) {
 		err = FAILED;
+	}
 
 	if (err == OK) {
 		size_t index = 0;