fix: save hex symbol with color name

[wa0x6e]

See snapshot-labs/snapshot-sequencer#498 (comment)

This PR will save the # symbol together with the color code, to save extra processing on read and write

Run these SQL queries

ALTER TABLE skins
  MODIFY bg_color VARCHAR(7) DEFAULT NULL,
  MODIFY link_color VARCHAR(7) DEFAULT NULL,
  MODIFY text_color VARCHAR(7) DEFAULT NULL,
  MODIFY content_color VARCHAR(7) DEFAULT NULL,
  MODIFY border_color VARCHAR(7) DEFAULT NULL,
  MODIFY heading_color VARCHAR(7) DEFAULT NULL,
  MODIFY primary_color VARCHAR(7) DEFAULT NULL,
  MODIFY header_color VARCHAR(7) DEFAULT NULL;

UPDATE skins 
SET bg_color = CONCAT('#', bg_color)
WHERE bg_color IS NOT NULL;

UPDATE skins 
SET link_color = CONCAT('#', link_color)
WHERE link_color IS NOT NULL;

UPDATE skins 
SET text_color = CONCAT('#', text_color)
WHERE text_color IS NOT NULL;

UPDATE skins 
SET content_color = CONCAT('#', content_color)
WHERE content_color IS NOT NULL;

UPDATE skins 
SET border_color = CONCAT('#', border_color)
WHERE border_color IS NOT NULL;

UPDATE skins 
SET heading_color = CONCAT('#', heading_color)
WHERE heading_color IS NOT NULL;

UPDATE skins 
SET primary_color = CONCAT('#', primary_color)
WHERE primary_color IS NOT NULL;

UPDATE skins 
SET header_color = CONCAT('#', header_color)
WHERE header_color IS NOT NULL;

[ChaituVR]

tAck, i will run it on Prod DB and merge