Fix AE2 placeholders only working if Create is installed (#3606)

Author: screret

src/main/java/com/gregtechceu/gtceu/common/CommonProxy.java

@@ -138,8 +138,11 @@ public static void init() {
         GTPlaceholders.initPlaceholders();
         if (GTCEu.Mods.isCreateLoaded()) {
             GTCreateIntegration.init();
+        }
+        if (GTCEu.Mods.isAE2Loaded()) {
             GTAEPlaceholders.init();
         }
+
         GTCovers.init();
         GTFluids.init();
         GTCreativeModeTabs.init();