Fix incorrect OuterElementType in eex.lexer.TemplateData

Fixes #1992

The EEx IElementType needs to use OuterLanguageElementType instead of
the direct eex.psi.TokenType.

src/org/elixir_lang/eex/lexer/TemplateData.java

@@ -3,6 +3,8 @@
 import com.intellij.lexer.Lexer;
 import com.intellij.lexer.MergingLexerAdapterBase;
 import com.intellij.psi.tree.IElementType;
+import com.intellij.psi.tree.OuterLanguageElementType;
+import org.elixir_lang.eex.Language;
 import org.jetbrains.annotations.NotNull;
 
 import static org.elixir_lang.eex.psi.Types.DATA;
@@ -11,7 +13,7 @@
  * Merges together all EEx opening, body, and closing tokens into a single EEx type
  */
 public class TemplateData extends MergingLexerAdapterBase {
-    public static final IElementType EEX = new org.elixir_lang.eex.psi.TokenType("EEx");
+    public static final IElementType EEX = new OuterLanguageElementType("EEx", Language.INSTANCE);
 
     @NotNull
     private final MergeFunction mergeFunction = new MergeFunction();