Fix AE2 Things mod ID

The mod ID of AE2 Things is `ae2things`.
Ref: https://github.com/Technici4n/AE2Things-Forge/blob/4f2503cca033526a1299c800878360994d3649f1/src/main/java/io/github/projectet/ae2things/AE2Things.java#L38

Signed-off-by: Dongruixuan Li <dongruixuan@hotmail.com>

Author: starcatmeow

src/main/java/de/srendi/advancedperipherals/common/addons/APAddon.java

@@ -7,7 +7,7 @@
 public enum APAddon {
 
     AE2("ae2"),
-    AE2_THINGS("ae2_things"),
+    AE2_THINGS("ae2things"),
     APP_MEKANISTICS("appmek"),
     CURIOS("curios"),
     MEKANISM("mekanism"),