Fixed indentation of rainbow example

examples/plasma2040/plasma2040_rainbow.cpp

@@ -55,17 +55,17 @@ int main() {
   float offset = 0.0f;
 
   uint count = 0;
-    while (true) {
-        bool sw = user_sw.read();
-        bool a = button_a.read();
-        bool b = button_b.read();
+  while(true) {
+    bool sw_pressed = user_sw.read();
+    bool a_pressed = button_a.read();
+    bool b_pressed = button_b.read();
 
-        if(sw) {
+    if(sw_pressed) {
       speed = DEFAULT_SPEED;
     }
     else {
-            if(a) speed--;
-            if(b) speed++;
+      if(a_pressed) speed--;
+      if(b_pressed) speed++;
     }
     speed = std::min((int)255, std::max((int)1, speed));