Move mdk back to com/example/examplemod to align with what people expect.

build_forge.gradle

@@ -923,8 +923,8 @@ tasks.register('mdkZip', Zip) {
         rename 'gitignore\\.txt', '.gitignore'
         rename 'gitattributes\\.txt', '.gitattributes'
     }
-    from(rootProject.file('src/test/java/net/minecraftforge/example/')) {
-        into('src/main/java/net/minecraftforge/example/')
+    from(rootProject.file('src/test/java/com/example/examplemod/')) {
+        into('src/main/java/com/example/examplemod/')
     }
     from(rootProject.file('src/test/generated/mdk_datagen/')) {
         into('src/main/resources/')

src/test/java/com/example/examplemod/Config.java

@@ -1,4 +1,4 @@
-package net.minecraftforge.example;
+package com.example.examplemod;
 
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.Item;

src/test/java/com/example/examplemod/ExampleMod.java

@@ -1,4 +1,4 @@
-package net.minecraftforge.example;
+package com.example.examplemod;
 
 import com.mojang.logging.LogUtils;
 import net.minecraft.client.Minecraft;