WRR-287: Convert static color value by rgb() to hex value

Note that --sand-steps-pageindicator-bg-color is added
as we add CSS variables for non-common component-specific colors also.

Enact-DCO-1.0-Signed-off-by: Seungcheon Baek (sc.baek@lge.com)

styles/colors.less

@@ -93,6 +93,7 @@
 @sand-keyguide-bg-color-opacity: var(--sand-keyguide-bg-color-opacity, 0.9);
 @sand-slider-disabled-knob-bg-color: var(--sand-slider-disabled-knob-bg-color, #666666);
 @sand-iconitem-border-color: var(--sand-iconitem-border-color, #707070);
+@sand-steps-pageindicator-bg-color: var(--sand-steps-pageindicator-bg-color, #6f7680);
 
 // Overlay Alert
 // ---------------------------------------
@@ -404,7 +405,6 @@
 
 // Steps
 // ---------------------------------------
-@sand-steps-pageindicator-bg-color: rgb(111, 118, 128, 1);
 @sand-steps-pageindicator-current-bg-color: @sand-component-text-color;
 
 // Switch

styles/mixins.less

@@ -307,7 +307,7 @@
 
 .sand-focus-ring() {
 	transform: none;       
-	outline: 12px solid rgb(230,230,230);
+	outline: 12px solid #e6e6e6;
 	outline-offset: 9px;  
 }