Pica: Correct switched S/T texture wrapping registers

This was found and hwtested by Lectem

src/video_core/pica.h

@@ -132,8 +132,8 @@ struct Regs {
         };
 
         union {
-            BitField< 8, 2, WrapMode> wrap_s;
-            BitField<12, 2, WrapMode> wrap_t;
+            BitField< 8, 2, WrapMode> wrap_t;
+            BitField<12, 2, WrapMode> wrap_s;
         };
 
         INSERT_PADDING_WORDS(0x1);