better color for the placeholder text for disabled custom-select

apps/remix-ide/src/assets/css/themes/remix-black_undtds.css

@@ -3371,8 +3371,8 @@ input[type="submit"].btn-block {
   background-image: none;
 }
 .custom-select:disabled {
-  color: #272626;
+  color: #bdbed1;
-  background-color: ##222225;
+  background-color: #222225;
 }
 .custom-select::-ms-expand {
   display: none;

apps/remix-ide/src/assets/css/themes/remix-dark_tvx1s2.css

@@ -3371,7 +3371,7 @@ input[type="submit"].btn-block {
   background-image: none;
 }
 .custom-select:disabled {
-  color: #55566c;
+  color: #bdbed1;
   background-color: #282a3d;
 }
 .custom-select::-ms-expand {

apps/remix-ide/src/assets/css/themes/remix-hacker_owl.css

@@ -3385,7 +3385,7 @@ input[type="submit"].btn-block {
   background-image: none;
 }
 .custom-select:disabled {
-  color: #55566c;
+  color: #bdbed1;
   background-color: #282a3d;
 }
 .custom-select::-ms-expand {