Revert "Support relative line number on wrapped lines (#39268)" (#41450)

Closes #41422

This completely broke line numbering as described in the linked issue
and scrolling up does not have the correct numbers any more.

Release Notes:

- NOTE: The `relative_line_numbers` change
(https://github.com/zed-industries/zed/pull/39268) was reverted and did
not make the release cut!

crates/multi_buffer/src/multi_buffer.rs

@@ -340,7 +340,6 @@ pub struct RowInfo {
     pub multibuffer_row: Option<MultiBufferRow>,
     pub diff_status: Option<buffer_diff::DiffHunkStatus>,
     pub expand_info: Option<ExpandInfo>,
-    pub wrapped_buffer_row: Option<u32>,
 }
 
 /// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
@@ -6651,7 +6650,6 @@ impl Iterator for MultiBufferRows<'_> {
                 multibuffer_row: Some(MultiBufferRow(0)),
                 diff_status: None,
                 expand_info: None,
-                wrapped_buffer_row: None,
             });
         }
 
@@ -6709,7 +6707,6 @@ impl Iterator for MultiBufferRows<'_> {
                     buffer_row: Some(last_row),
                     multibuffer_row: Some(multibuffer_row),
                     diff_status: None,
-                    wrapped_buffer_row: None,
                     expand_info,
                 });
             } else {
@@ -6754,7 +6751,6 @@ impl Iterator for MultiBufferRows<'_> {
                 .diff_hunk_status
                 .filter(|_| self.point < region.range.end),
             expand_info,
-            wrapped_buffer_row: None,
         });
         self.point += Point::new(1, 0);
         result