fix(mps-model-server-plugin): add plugin dependency on MPS

It's being used by the plugin verifier when uploading the plugin to the
JetBrains marketplace to detect the compatible IDEs. For classloading
it's not required.

Author: slisson

mps-model-server-plugin/src/main/resources/META-INF/plugin.xml

@@ -19,7 +19,8 @@
 
     <!-- Product and plugin compatibility requirements.
          Read more: https://plugins.jetbrains.com/docs/intellij/plugin-compatibility.html -->
-    <depends>com.intellij.modules.platform</depends>
+    <depends>com.intellij.modules.mps</depends>
+    <depends>jetbrains.mps.core</depends>
 
     <applicationListeners>
         <listener