Heavy Core and Dragon Head Preview Offset in Command Suggestions

The heavy core and dragon head icon are offset to the left in the command suggestions.

Steps to Reproduce:

1. Create a world with commands enabled
2. Open up the chat menu
3. Type a command that would suggest either the heavy core or the dragon head (/give, /setblock, /replaceitem, /testforblock, etc)
4. Notice that the icon is offset.

Expected Result:

1. The heavy core and dragon head would be centered like the other blocks