Update Java snippet template: removed 'public' from class to avoid filename mismatch errors on Godbolt.

Fix Java template to use non-public class for compatibility with Godbolt's virtual filename behavior

Author: mx7b7

src/CodeSnip/Views/SnippetView/SnippetViewModel.cs

@@ -210,7 +210,7 @@ fn main() {
 ".Trim(),
 
             ["java"] = @"
-public class HelloWorld {
+class HelloWorld {
     public static void main(String[] args) {
         System.out.println(""Hello, World!"");
     }