Add set_pattern_step

src/patterns.py

@@ -39,6 +39,9 @@ class Patterns:
         self.last_update = utime.ticks_ms() - self.delay
         self.tick()
 
+    def set_pattern_step(self, step):
+        self.pattern_step = step
+
     def tick(self):
         if self.patterns[self.selected]:
             self.patterns[self.selected]()