Exclude .kt files from misnamed reftype query

Author: tamasvajk

java/ql/src/Advisory/Naming/NamingConventionsRefTypes.ql

@@ -12,7 +12,7 @@ import java
 
 from RefType t
 where
-  t.fromSource() and
+  t.getFile().isJavaSourceFile() and
   not t instanceof AnonymousClass and
   not t.getName().substring(0, 1).toUpperCase() = t.getName().substring(0, 1)
 select t, "Class and interface names should start in uppercase."

java/ql/test/kotlin/query-tests/NamingConventionsRefTypes/NamingConventionsRefTypes.expected

@@ -1,3 +0,0 @@
-| Test.kt:3:23:5:9 |  | Class and interface names should start in uppercase. |
-| Test.kt:7:9:8:9 |  | Class and interface names should start in uppercase. |
-| Test.kt:12:1:12:13 | aaaa | Class and interface names should start in uppercase. |