Fix to examples/platform/linux/BUILD.gn to resolve gn gen --check for EGC test events (project-chip#38601)

* Fix to BUILD.gn to resolve gn gen --check for EGC test event header file

* Restyled by gn

---------

Co-authored-by: Restyled.io <[email protected]>

Author: jamesharrow

examples/platform/linux/BUILD.gn

@@ -67,6 +67,10 @@ source_set("commodity-price-test-event-trigger") {
   sources = [ "${chip_root}/src/app/clusters/commodity-price-server/CommodityPriceTestEventTriggerHandler.h" ]
 }
 
+source_set("electrical-grid-conditions-test-event-trigger") {
+  sources = [ "${chip_root}/src/app/clusters/electrical-grid-conditions-server/ElectricalGridConditionsTestEventTriggerHandler.h" ]
+}
+
 source_set("energy-evse-test-event-trigger") {
   sources = [ "${chip_root}/src/app/clusters/energy-evse-server/EnergyEvseTestEventTriggerHandler.h" ]
 }
@@ -111,6 +115,7 @@ source_set("app-main") {
     ":commissioner-main",
     ":commodity-price-test-event-trigger",
     ":device-energy-management-test-event-trigger",
+    ":electrical-grid-conditions-test-event-trigger",
     ":energy-evse-test-event-trigger",
     ":energy-reporting-test-event-trigger",
     ":smco-test-event-trigger",