MOBILE-3320 style: Remove unused vars

src/theme/globals.variables.scss

@@ -46,7 +46,6 @@ $ion-item-background-dark: mix(#ffffff, #000000, 80%) !default; // #333333
 $ion-item-background-dark-rgb: color-to-rgb-list($ion-item-background-dark) !default;
 
 $primary:    $brand-color !default;
-$secondary:  $blue !default;
 $danger:     $red !default;
 $warning:    $yellow !default;
 $success:    $green !default;
@@ -57,7 +56,6 @@ $dark:       $black !default;
 
 $colors:  (
     primary: $primary,
-    secondary: $secondary,
     success: $success,
     warning: $warning,
     danger:  $danger,
@@ -68,7 +66,6 @@ $colors:  (
 ) !default;
 
 $primary-dark:    $brand-color !default;
-$secondary-dark:  mix($blue, white, 40%) !default;
 $danger-dark:     mix($red, white, 40%) !default;
 $warning-dark:    mix($yellow, white, 40%) !default;
 $success-dark:    mix($green, white, 40%) !default;
@@ -79,7 +76,6 @@ $dark-dark:       $light !default;
 
 $colors-dark:  (
     primary: $primary-dark,
-    secondary: $secondary-dark,
     success: $success-dark,
     warning: $warning-dark,
     danger: $danger-dark,

src/theme/theme.dark.scss

@@ -38,7 +38,6 @@
     --subdued-text-color:     #b4b4b4;
 
     --primary:      var(--brand-color);
-    --secondary:    #{$secondary-dark};
     --success:      #{$success-dark};
     --danger:       #{$danger-dark};
     --warning:      #{$warning-dark};

src/theme/theme.light.scss

@@ -45,7 +45,6 @@
 
     // Named Color Variables
     --primary:      var(--brand-color);
-    --secondary:    #{$secondary};
     --success:      #{$success};
     --danger:       #{$danger};
     --warning:      #{$warning};
@@ -263,7 +262,6 @@
     --addon-calendar-event-user-color: var(--blue);
     --addon-calendar-event-site-color: var(--green);
     --addon-calendar-today-border-color: var(--primary);
-    --addon-calendar-today-color: var(--white);
     --addon-calendar-border-color: var(--gray);
 
     --addon-messages-message-bg: var(--white);