[FL-2811] Fix PVS-Studio warnings (#2142)

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>

lib/toolbox/float_tools.c

@@ -0,0 +1,8 @@
+#include "float_tools.h"
+
+#include <math.h>
+#include <float.h>
+
+bool float_is_equal(float a, float b) {
+    return fabsf(a - b) <= FLT_EPSILON * fmaxf(fabsf(a), fabsf(b));
+}