[FIX] web : dark purple color doesn't work

Step to reproduce

- go to planning app
- configuration > roles
- set the color of a role to dark purple
- schedule > by role

The dark purple is not set, instead of that, #3daec3 is displayed.

opw-2601898

closes odoo/odoo#74185

X-original-commit: ee38f8e393e937c5694e6b75cd05b8a35d4f1624
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Signed-off-by: guva-odoo <guva-odoo@users.noreply.github.com>

addons/web/static/src/legacy/scss/secondary_variables.scss

@@ -15,7 +15,7 @@ $o-colors-secondary: #aa4b6b, #30C381, #97743a, #F7CD1F, #4285F4, #8E24AA,
 
 // UI custom colors, complete list
 $o-colors-complete: join(
-    set-nth(set-nth($o-colors, 1, #134E5E), 6, #3daec3),
+    set-nth($o-colors, 1, #134E5E),
     $o-colors-secondary
 )!default;