mayushii: Adjust charge thresholds

Because I most of the time use it with a charger connected, this avoids
it charging after begin unplugged for a short amount of time and just
barely falling below the threshold.

machines/mayushii/hardware-configuration.nix

@@ -47,8 +47,8 @@
   services.tlp = {
     enable = true;
     settings = {
-      START_CHARGE_THRESH_BAT0 = 75;
-      STOP_CHARGE_THRESH_BAT0 = 92;
+      START_CHARGE_THRESH_BAT0 = 40;
+      STOP_CHARGE_THRESH_BAT0 = 90;
       USB_DENYLIST = lib.concatStringsSep " " [
       ];
     };