Revert t variable type to float instead of double

For the sake of simplicity and consistency.

flix/cli.ino

@@ -9,8 +9,7 @@
 
 extern const int MOTOR_REAR_LEFT, MOTOR_REAR_RIGHT, MOTOR_FRONT_RIGHT, MOTOR_FRONT_LEFT;
 extern const int ACRO, STAB, AUTO;
-extern float loopRate, dt;
-extern double t;
+extern float t, dt, loopRate;
 extern uint16_t channels[16];
 extern float controlRoll, controlPitch, controlThrottle, controlYaw, controlMode;
 extern int mode;
@@ -60,7 +59,7 @@ void print(const char* format, ...) {
 }
 
 void pause(float duration) {
-	double start = t;
+	float start = t;
 	while (t - start < duration) {
 		step();
 		handleInput();