Modules.xml: add Java sources right after Kotlin sources

Java sources should appear before classpath dependencies because they should
have higher priority if the same symbol is located in the module source and in
the classpath. This is so because by default module source has the highest
priority in IDEA except the JDK. Ideally this will be handled later by full
support of modules in the compiler

idea/testData/modules.xml/basic.xml

@@ -3,9 +3,11 @@
     <module name="name" outputDir="output">
         <sources path="s1"/>
         <sources path="s2"/>
+        <!-- Java source roots -->
+        <classpath path="java"/>
         <!-- External annotations -->
-        <externalAnnotations path= "a1/f1"/>
-        <externalAnnotations path= "a2"/>
+        <externalAnnotations path="a1/f1"/>
+        <externalAnnotations path="a2"/>
         <!-- s1 -->
         <classpath path="cp1"/>
         <classpath path="cp2"/>