E85 backlight & LED indicator updates (#10678)

* Enable in-switch backlight on e85 for VIA keymaps.

Update LED indicator code for e85 hotswap/soldered PCBs.

keyboards/exclusive/e85/soldered/soldered.c

@@ -17,14 +17,16 @@
 #include "soldered.h"
 
 void keyboard_pre_init_kb(void) {
-  setPinOutput(C7);
-  
-  keyboard_pre_init_user();
+    setPinOutput(C7);
+    setPinOutput(B5);
+
+    keyboard_pre_init_user();
 }
 
 bool led_update_kb(led_t led_state) {
     if (led_update_user(led_state)) {
         writePin(C7, led_state.caps_lock);
+        writePin(B5, led_state.scroll_lock);
     }
     return true;
 }