Made the Rad button text change when pressed

pressing the Rad button will display the mode that the calculator is in
on the button. it will change from Ans | Rad to Ans | Deg.
Made open brackets call multiply

So that 2(6) should = 12. Still some visual glitches involved.
Fixed open bracket multiply operator

Open brackets should act like multiplies when no operator is present, so
2(3+1) = 8. My code gave the answer 7 because the number 2 was
erroneously given the current bracket variable meaning it was basically
calculating (2*3+1) fixed it by incrementing the currentBracket variable
after setting the operator to multiply.