fix(dropdowns): Allow for dropdowns to fill full column (#2684)

* fix(dropdowns): Allow for dropdowns to fill full column

When the text inside a dropdown is longer than it is for English, the text is truncated which can result in a less-than-usable experience for languages such as German with longer words. This commit addresses the following:

* Allow the dropdown to expand to the entire width of the column based on the length of the text in the dropdown
* Align active dropdown arrow in relation to the trigger rather than the dropdown
* Show the right hand side of the dropdown which was previously hidden (could not see border radius)
* Ensure the three places dropdowns of status, account, and emoji appear well in Chrome, Firefox, Safari

* fix(emoji-dropdown): Restore emoji dropdown caret