message: Convert `private` to `#` method in `CharCellLine`
diff: @@ -474,12 +474,12 @@ export class CharCellLine {
  this.#dataView.setUint16(offset + OFFSET_FG_CLUT_INDEX, index);
  - this._updateInternalRGB(index, offset);
  + this.#updateInternalRGB(index, offset);
  this.#dirtyFlag = true;
  }
  - private _updateInternalRGB(index: number, offset: number): void {
  + #updateInternalRGB(index: number, offset: number): void {
  if (this.palette != null) {
  const style = this.#dataView.getUint16(offset + OFFSET_STYLE);
  let rgba = 0;
  @@ -534,7 +534,7 @@ export class CharCellLine {
  const ifFgClut = this.#dataView.getUint8(offset + OFFSET_FLAGS) & FLAG_MASK_FG_CLUT;
  if (ifFgClut) {
  const index = this.#dataView.getUint16(offset + OFFSET_FG_CLUT_INDEX);
  - this._updateInternalRGB(index, offset);
  + this.#updateInternalRGB(index, offset);
  }
  this.#dirtyFlag = true;
  }
  