Fix NanoDSLFileType.getName() to return "NanoDSLFile"

Agent-Id: agent-41c63fe1-642a-4f2c-9650-17c3128f1972
Linked-Note-Id: 9bfd0c0e-7607-47e7-a473-c73050714c28

Author: phodal

mpp-idea/mpp-idea-exts/nanodsl-lang/src/main/kotlin/cc/unitmesh/nanodsl/language/NanoDSLFileType.kt

@@ -4,7 +4,7 @@ import com.intellij.openapi.fileTypes.LanguageFileType
 import javax.swing.Icon
 
 object NanoDSLFileType : LanguageFileType(NanoDSLLanguage) {
-    override fun getName(): String = "NanoDSL"
+    override fun getName(): String = "NanoDSLFile"
 
     override fun getDescription(): String = "NanoDSL Language File"