reverted button value.

i reverted button value back to original.

Author: ItzSgtTanker

src/simplejavacalculator/UI.java

@@ -37,7 +37,7 @@ public class UI implements ActionListener {
     private final Calculator calc;
 
     private final String[] buttonValue = { "0", "1", "2", "3", "4", "5", "6",
-            "7", "8", "9", "10" };
+            "7", "8", "9"};
 
     public UI() {
         frame = new JFrame("Calculator PH");