fix #69, weird behaviour at renaming note

app/src/main/kotlin/com/simplemobiletools/notes/dialogs/RenameNoteDialog.kt

@@ -32,7 +32,7 @@ class RenameNoteDialog(val activity: Activity, val db: DBHelper, val note: Note,
                     activity.toast(R.string.title_taken)
                 } else {
                     note.title = title
-                    db.updateNote(note)
+                    db.updateNoteTitle(note)
                     dismiss()
                     callback.invoke(note)
                 }

app/src/main/kotlin/com/simplemobiletools/notes/fragments/NoteFragment.kt

@@ -62,7 +62,7 @@ class NoteFragment : Fragment() {
         val oldText = note.value
         if (newText != oldText) {
             note.value = newText
-            mDb.updateNote(note)
+            mDb.updateNoteValue(note)
             context.updateWidget()
         }
     }

app/src/main/kotlin/com/simplemobiletools/notes/helpers/DBHelper.kt

@@ -125,10 +125,19 @@ class DBHelper private constructor(private val mContext: Context) : SQLiteOpenHe
         return note
     }
 
-    fun updateNote(note: Note) {
-        val values = fillContentValues(note)
+    fun updateNoteValue(note: Note) {
+        val values = ContentValues().apply { put(COL_VALUE, note.value) }
+        updateNote(note.id, values)
+    }
+
+    fun updateNoteTitle(note: Note) {
+        val values = ContentValues().apply { put(COL_TITLE, note.title) }
+        updateNote(note.id, values)
+    }
+
+    fun updateNote(id: Int, values: ContentValues) {
         val selection = "$COL_ID = ?"
-        val selectionArgs = arrayOf(note.id.toString())
+        val selectionArgs = arrayOf(id.toString())
         mDb.update(TABLE_NAME, values, selection, selectionArgs)
     }
 }