feat: remove FPS global define from libpasada

pasada-lib/step_detector.cpp

@@ -13,10 +13,6 @@ StepDetector::StepDetector(double fps, StepListener *listener, bool debug) :
     debug(debug)
 {}
 
-#if (FPS != 60)
-#error "FPS must currently be 60, as highpass taps are pre-computed for that value"
-#endif
-
 void StepDetector::filter(std::vector<float> values) {
     // TODO: later on, we should use a vector projection towards gravity
     auto s1 = (double) values[1]; // take y-axis value for now