fix: add more tests for remove first package coverage

Author: steff456

lib/node_modules/@stdlib/string/base/remove-first-code-point/test/test.js

@@ -71,7 +71,7 @@ tape( 'the function removes the first Unicode code point of a provided string (U
 	out = removeFirst( '𐒻𐓟', 1 );
 	t.strictEqual( out, '𐓟', 'returns expected value' );
 
-	out = removeFirst( '\uDC00', 1 );
+	out = removeFirst( '\uD800', 1 );
 	t.strictEqual( out, '', 'returns expected value' );
 
 	t.end();