Only skip flags in XCLC if they exist

I guess older esp files don't have flags in the struct, which wasn't mentioned by the UESP mod file format page.

src/parser.rs

@@ -487,8 +487,13 @@ fn parse_cell_fields<'a>(input: &'a [u8]) -> IResult<&'a [u8], CellData> {
                 let (remaining, y) = le_i32(remaining)?;
                 cell_data.x = Some(x);
                 cell_data.y = Some(y);
+                if field.size == 12 {
+                    // older (v. 0.94) files don't have the flags in this struct
                     let (remaining, _) = take(4usize)(remaining)?;
                     input = remaining;
+                } else {
+                    input = remaining;
+                }
             }
             "XXXX" => {
                 let (remaining, size) = le_u32(input)?;