Color Picker: Set initial hex value for picker (closes #20326)#20357

AndyButland merged 2 commits intoumbraco:mainumbraco/Umbraco-CMS:mainfrom

bjarnef:v16/bugfix/20326-color-picker-initial-valuebjarnef/Umbraco-CMS:v16/bugfix/20326-color-picker-initial-valueCopy head branch name to clipboard