Removes unused code

src/main/java/CredentialRepository.java

@@ -89,23 +89,6 @@ public class CredentialRepository implements CredentialRepositoryInterface{
 
     }
 
-/*
-    this function will be required in the future for catching the left-shift in the arrayList
-    after one entry was deleted. welp, maybe it won't. can't tell and i've no time atm to
-    finish this
-
-
-    private int mapIndexToListCounter(int needle) {
-        for(int c = 0; c<this.credentials.size(); c++)
-        {
-            if(this.credentials.get(c).getId() == needle)
-            {
-                return c;
-            }
-        }
-        return -1;
-    }
-*/
     private int getListSize()
     {
         return this.credentials.size();