refactor(NonReversedShapedRecipe): use diamond operator

ref:
本の虫: java 7が斜め上を行っている件について
https://cpplover.blogspot.com/2009/11/java-7.html

src/main/java/com/example/examplemod/NonReversedShapedRecipe.java

@@ -37,7 +37,7 @@ public static ShapedRecipes addShapedRecipe(ItemStack output, Object... params)
 
 		HashMap<Character, ItemStack> hashmap;
 
-		for (hashmap = new HashMap<Character, ItemStack>(); i < params.length; i += 2) {
+		for (hashmap = new HashMap<>(); i < params.length; i += 2) {
 			Character character = (Character) params[i];
 			ItemStack itemstack1 = null;