Fix icon colors in column picker (#42945)

* Make icons 16px in data picker

* Use text-light in DataPicker to match other icons

frontend/src/metabase/common/components/FieldPicker/FieldPicker.styled.tsx

@@ -13,7 +13,7 @@ export const ItemTitle = styled.div`
 export const ItemIcon = styled(QueryColumnInfoIcon)`
   margin: 0 0.5em;
   margin-left: 0.75em;
-  color: ${color("text-dark")};
+  color: ${color("text-light")};
 `;
 
 export const ItemList = styled.ul`

frontend/src/metabase/common/components/FieldPicker/FieldPicker.tsx

@@ -92,7 +92,7 @@ export const FieldPicker = ({
                 stageIndex={stageIndex}
                 column={item.column}
                 position="top-start"
-                size={18}
+                size={16}
               />
               <ItemTitle>{item.columnInfo.displayName}</ItemTitle>
             </Label>