Fix compiler warnings: sketch/fsensor.cpp: In function 'void __vector_11()':

sketch/fsensor.cpp:370:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if (pat9125_y > 0) if (fsensor_oq_yd_min > pat9125_y) fsensor_oq_yd_min = (fsensor_oq_yd_min + pat9125_y) / 2;
                                                  ^
sketch/fsensor.cpp:371:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if (pat9125_y >= 0) if (fsensor_oq_yd_max < pat9125_y) fsensor_oq_yd_max = (fsensor_oq_yd_max + pat9125_y) / 2;

Firmware/fsensor.cpp

@@ -101,9 +101,9 @@ uint16_t fsensor_oq_er_sum;
 //max error counter value durring meassurement
 uint8_t  fsensor_oq_er_max;
 //minimum delta value
-uint16_t fsensor_oq_yd_min;
+int16_t fsensor_oq_yd_min;
 //maximum delta value
-uint16_t fsensor_oq_yd_max;
+int16_t fsensor_oq_yd_max;
 //sum of shutter value
 uint16_t fsensor_oq_sh_sum;