Fixed the issue related to the privilege checkbox color in disabled mode.

web/pgadmin/static/js/Theme/dark.js

@@ -61,6 +61,9 @@ export default function(basicSettings) {
         primary: '#d4d4d4',
         muted: '#8A8A8A',
       },
+      checkbox: {
+        disabled: '#6b6b6b'
+      },
       background: {
         paper: '#212121',
         default: '#212121',

web/pgadmin/static/js/Theme/high_contrast.js

@@ -59,6 +59,9 @@ export default function(basicSettings) {
         primary: '#fff',
         muted: '#8b9cac',
       },
+      checkbox: {
+        disabled: '#6b6b6b'
+      },
       background: {
         paper: '#010B15',
         default: '#010B15',

web/pgadmin/static/js/Theme/index.jsx

@@ -368,10 +368,9 @@ function getFinalTheme(baseTheme) {
 
         colorPrimary: {
           '&.Mui-disabled': {
-            color: baseTheme.palette.text.muted
+            color: baseTheme.palette.checkbox.disabled
           }
         }
-
       },
       MuiToggleButton: {
         root: {

web/pgadmin/static/js/Theme/standard.js

@@ -60,6 +60,9 @@ export default function(basicSettings) {
         primary: '#222',
         muted: '#646B82',
       },
+      checkbox: {
+        disabled: '#ebeef3'
+      },
       background: {
         paper: '#fff',
         default: '#fff',