move the function for getting note value in the note model itself

app/src/main/kotlin/com/simplemobiletools/notes/models/Note.kt

@@ -1,3 +1,18 @@
 package com.simplemobiletools.notes.models
 
-data class Note(var id: Int, var title: String, var value: String, val type: Int, var path: String = "")
+import java.io.File
+import java.io.FileNotFoundException
+
+data class Note(var id: Int, var title: String, var value: String, val type: Int, var path: String = "") {
+    fun getNoteStoredValue(): String? {
+        return if (path.isNotEmpty()) {
+            return try {
+                File(path).readText()
+            } catch (e: FileNotFoundException) {
+                null
+            }
+        } else {
+            value
+        }
+    }
+}