Update CSS variables to ensure TinyMCE sslink popup windows are not h…

…idden behind fullscreen mode

client/src/styles/_bootstrap-variables.scss

@@ -528,13 +528,13 @@ $dropdown-item-padding-x:        1.3rem !default;
 // Warning: Avoid customizing these values. They're used for a bird's eye view
 // of components dependent on the z-axis and are designed to all work together.
 
-//$zindex-dropdown:           1000 !default;
-//$zindex-sticky:             1020 !default;
-//$zindex-fixed:              1030 !default;
-//$zindex-modal-backdrop:     1040 !default;
-//$zindex-modal:              1050 !default;
-//$zindex-popover:            1060 !default;
-//$zindex-tooltip:            1070 !default;
+//$zindex-dropdown:           1200 !default;
+//$zindex-sticky:             1220 !default;
+//$zindex-fixed:              1230 !default;
+//$zindex-modal-backdrop:     1240 !default;
+//$zindex-modal:              1250 !default;
+//$zindex-popover:            1260 !default;
+//$zindex-tooltip:            1270 !default;
 
 // Navs
 

client/src/styles/_variables.scss

@@ -91,9 +91,9 @@ $input-padding-y-lg: .75rem;
 // Warning: Avoid customizing these values. They're used for a bird's eye view
 // of components dependent on the z-axis and are designed to all work together.
 
-$zindex-popover: 1060;
-$zindex-modal-bg: 1040;
-$zindex-modal: 1050;
+$zindex-popover: 1260;
+$zindex-modal-bg: 1240;
+$zindex-modal: 1250;
 $zindex-cms-content-header: 60;
 $zindex-cms-content-actions: 79;
 $zindex-menu: $zindex-cms-content-actions + 1;