Custom Color Scheme defaults to Raven color variables; makes the them…

…e usable without the required user defined CSS snippet #158

src/scss/Color Schemes/colorSchemeBird.scss

@@ -1,5 +1,6 @@
 // [Color Scheme - Bird] Light Theme
 .theme-light.pt-color-scheme-swan-lt,
+.theme-light.pt-color-scheme-custom-lt,
 .theme-light:not(.css-settings-manager) { // Fills in enough colours to see the theme when Style Settings isn't enabled
 	// The color variables below are comma separated HSL values. This format is necessary for using these
 	// variables down the line in the theme and being able to create variants with varying alpha values (HSLA).
@@ -61,6 +62,7 @@
 
 // [Color Scheme - Default] Dark Theme
 .theme-dark.pt-color-scheme-raven-dt,
+.theme-dark.pt-color-scheme-custom-dt,
 .theme-dark:not(.css-settings-manager) { // Fills in enough colours to see the theme when Style Settings isn't enabled
 	// The color variables below are comma separated HSL values. This format is necessary for using these
 	// variables down the line in the theme and being able to create variants with varying alpha values (HSLA).