Revert "Enable type on search by default for the project search (#49374)" (#49619)

This reverts commit 1d66bbe06f.

Needs 2 more fixes:

* enter does not move to the first excerpt anymore
* there could be situations when a narrowed search does not decrease the
excerpt enough to see the result onscreen

Release Notes:

- N/A

crates/multi_buffer/src/multi_buffer.rs

@@ -1734,7 +1734,7 @@ impl MultiBuffer {
     }
 
     #[instrument(skip_all)]
-    pub fn merge_excerpt_ranges<'a>(
+    fn merge_excerpt_ranges<'a>(
         expanded_ranges: impl IntoIterator<Item = &'a ExcerptRange<Point>> + 'a,
     ) -> (Vec<ExcerptRange<Point>>, Vec<usize>) {
         let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();