Significantly raise BMI MaxValue (#729)

BMI over 50 is not unlikely, raise the value to something extreme.

BMI 125 would be about 300kg at 1.55m body height.

android_app/app/src/main/java/com/health/openscale/gui/measurement/BMIMeasurementView.java

@@ -58,7 +58,7 @@ public class BMIMeasurementView extends FloatMeasurementView {
 
     @Override
     protected float getMaxValue() {
-        return 50;
+        return 125;
     }
 
     @Override