CCT bus manager logic simplification

CCT from RGB if none set (-1)

wled00/data/settings_leds.htm

@@ -510,7 +510,9 @@ ${i+1}:
     <hr style="width:260px">
     Make a segment for each output: <input type="checkbox" name="MS"> <br>
     Custom bus start indices: <input type="checkbox" onchange="tglSi(this.checked)" id="si"> <br>
-    Allow WB correction:  <input type="checkbox" name="CCT"> <br>
+    White Balance correction: <input type="checkbox" name="CCT"> <br>
+    Calculate CCT from RGB: TODO<br>
+    CCT blending mode: TODO<br>
     <hr style="width:260px">
     <div id="btns"></div>
     Touch threshold: <input type="number" class="s" min="0" max="100" name="TT" required><br>