fixup! ExactCalculator: Clean up unused and redundant code

Test: 4.2/3*2
Change-Id: Ib058d2e2c962b14d3c41d2484b713e857d44b7b7

Author: luk1337

src/com/android/calculator2/CalculatorExpr.java

@@ -867,6 +867,7 @@ private EvalRet evalTerm(int i, EvalContext ec) throws SyntaxException {
                 val = val.multiply(tmp.val);
             }
             cpos = tmp.pos;
+            is_mul = is_div = false;
         }
         return new EvalRet(cpos, val);
     }