Fix incorrect coremod launch argument

There should be an equals sign not a space

Author: simon816

src/main/java/net/minecraftforge/gradle/user/patcherUser/forge/ForgePlugin.java

@@ -245,8 +245,7 @@ protected List<String> getClientJvmArgs(ForgeExtension ext)
         List<String> out = ext.getResolvedClientJvmArgs();
         if (!Strings.isNullOrEmpty(ext.getCoreMod()))
         {
-            out.add("-Dfml.coreMods.load");
-            out.add(ext.getCoreMod());
+            out.add("-Dfml.coreMods.load=" + ext.getCoreMod());
         }
         return out;
     }
@@ -257,8 +256,7 @@ protected List<String> getServerJvmArgs(ForgeExtension ext)
         List<String> out = ext.getResolvedServerJvmArgs();
         if (!Strings.isNullOrEmpty(ext.getCoreMod()))
         {
-            out.add("-Dfml.coreMods.load");
-            out.add(ext.getCoreMod());
+            out.add("-Dfml.coreMods.load=" + ext.getCoreMod());
         }
         return out;
     }