Bug 1847746 - Content Description on Print and Save to Save To PDF

The content description was incorrectly set on the print and save to
PDF icon as "close". The content description should be null because the
elements are decorative and are a part of a compose button.

app/src/main/java/org/mozilla/fenix/share/PrintItem.kt

@@ -43,9 +43,7 @@ fun PrintItem(
 
         Icon(
             painter = painterResource(R.drawable.ic_print),
-            contentDescription = stringResource(
-                R.string.content_description_close_button,
-            ),
+            contentDescription = null,
             tint = FirefoxTheme.colors.iconPrimary,
         )
 

app/src/main/java/org/mozilla/fenix/share/SaveToPDFItem.kt

@@ -43,9 +43,7 @@ fun SaveToPDFItem(
 
         Icon(
             painter = painterResource(R.drawable.ic_download),
-            contentDescription = stringResource(
-                R.string.content_description_close_button,
-            ),
+            contentDescription = null,
             tint = FirefoxTheme.colors.iconPrimary,
         )