Expand code owner check output area

The output textarea in the code owner check component introduced in
Change 495381 is too small, making it difficult to read longer results.

This change increases the number of visible rows from the default 2 to
20, improving usability by allowing more of the output to be seen at
once.

Google-Bug-Id: b/437250084
Release-Notes: skip
Change-Id: If17820dad3ddbdc193174e1cce3030b6ebeb1ea5

web/gr-check-code-owner.ts

diff --git a/web/gr-check-code-owner.ts b/web/gr-check-code-owner.ts
index 04f8ee5..7225d3f 100644
--- a/web/gr-check-code-owner.ts
+++ b/web/gr-check-code-owner.ts
@@ -213,6 +213,7 @@
             <textarea
               class="output"
               id="resultOutput"
+              rows="20"
               readonly
             >
             </textarea>