Interpreter_FPUtils: Unset FPSCR.FI and FPSCR.FR when FPSCR.ZX is set in NI_div()

Another bit of behavior that we weren't performing correctly is the
unsetting of FPSCR.FI and FPSCR.FR when FPSCR.ZX is supposed to be set.
This is supported in PEM's section 3.3.6.1 where the following is
stated:

"
When a zero divide condition occurs, the following actions are taken:

- Zero divide exception condition bit is set FPSCR[ZX] = 1.
- FPSCR[FR, FI] are cleared.
"

And so, this fixes that behavior.

Source/Core/Core/PowerPC/Interpreter/Interpreter_FPUtils.h

@@ -134,6 +134,8 @@ inline double NI_div(double a, double b)
       else
       {
         SetFPException(FPSCR_ZX);
+        FPSCR.FI = 0;
+        FPSCR.FR = 0;
       }
     }
     else if (std::isinf(a) && std::isinf(b))