Fix pca9632_set_led_color

…when used with an I2C screen.

Co-Authored-By: soimy <soimy@163.com>

Marlin/src/feature/leds/pca9632.cpp

 #endif
 
 void pca9632_set_led_color(const LEDColor &color) {
+  Wire.begin();
   if (!PCA_init) {
     PCA_init = 1;
-    Wire.begin();
     PCA9632_WriteRegister(PCA9632_ADDRESS,PCA9632_MODE1, PCA9632_MODE1_VALUE);
     PCA9632_WriteRegister(PCA9632_ADDRESS,PCA9632_MODE2, PCA9632_MODE2_VALUE);
   }