Fix: DPL settings: do not reset solar_passthrough_enabled

we must not reset the configuration switch value in this context. this
leads to solar passthrough being disabled once the DPL is disabled. when
re-enabling the DPL, solar passthrough is suddenly off, even though the
user configured it to be on.

the configuration switch can stay on. the DPL will still sanity-check
whether or not solar-passthrough can be used (checks if VE.Direct is
enabled) or it is irrelevant since the DPL is disabled.

webapp/src/views/PowerLimiterAdminView.vue

@@ -501,11 +501,7 @@ export default defineComponent({
         canUseSolarPassthrough() {
             const cfg = this.powerLimiterConfigList;
             const meta = this.powerLimiterMetaData;
-            const canUse = this.isEnabled() && meta.charge_controller_enabled && !cfg.is_inverter_solar_powered;
-            if (!canUse) {
-                cfg.solar_passthrough_enabled = false;
-            }
-            return canUse;
+            return this.isEnabled() && meta.charge_controller_enabled && !cfg.is_inverter_solar_powered;
         },
         canUseSoCThresholds() {
             const cfg = this.powerLimiterConfigList;