Remove EuiDescritpionList IE comments

- Many consumers are overriding `width` instead of `flex-basis` at this point for the component, so changing it to flex-basis would cause unnecessary churn
- `width` is also still valid and intuitive to use instead over flex-basis

Author: cee-chen

src/components/description_list/description_list_description.styles.ts

@@ -22,7 +22,7 @@ export const euiDescriptionListDescriptionStyles = (
   const { euiTheme } = euiThemeContext;
 
   const columnDisplay = `
-    ${logicalCSS('width', '50%')} // Flex-basis doesn't work in IE with padding
+    ${logicalCSS('width', '50%')}
     ${logicalCSS('padding-left', euiTheme.size.s)}
     &:not(:first-of-type) {
       ${logicalCSS('margin-top', euiTheme.size.base)}

src/components/description_list/description_list_title.styles.ts

@@ -21,7 +21,7 @@ export const euiDescriptionListTitleStyles = (euiThemeContext: UseEuiTheme) => {
   const { euiTheme, colorMode } = euiThemeContext;
 
   const columnDisplay = `
-    ${logicalCSS('width', '50%')} // Flex-basis doesn't work in IE with padding
+  ${logicalCSS('width', '50%')}
     ${logicalCSS('padding-right', euiTheme.size.s)}
   `;
   return {