Remove unused setName method from PlayerData

The setName method was not being used and has been removed to clean up the code. This improves maintainability by eliminating unnecessary methods.

Author: VLTNOgithub

src/main/java/com/vltno/timeloop/PlayerData.java

@@ -16,10 +16,6 @@ public String getName() {
         return name;
     }
 
-    public void setName(String name) {
-        this.name = name;
-    }
-
     public String getNickname() {
         return nickname;
     }