fix ./build_viewer.sh run

```
./build_viewer.sh run
````
would fail as we were in the wrong working directory!

Diffs=
852b17bca fix ./build_viewer.sh run (#6545)

Co-authored-by: Luigi Rosso <luigi-rosso@users.noreply.github.com>

.rive_head

diff --git a/.rive_head b/.rive_head
index f655e8e..ab6d12c 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-029d674655205fe659cd95fc4822dc69706e8d25
+852b17bca7e7c2d3deb7f2d09876b3b548115200

viewer/build/macosx/build_viewer.sh

diff --git a/viewer/build/macosx/build_viewer.sh b/viewer/build/macosx/build_viewer.sh
index 402cf2d..f41f0fe 100755
--- a/viewer/build/macosx/build_viewer.sh
+++ b/viewer/build/macosx/build_viewer.sh
@@ -67,8 +67,6 @@
 
 make -C $OUT -j$(($(sysctl -n hw.physicalcpu) + 1))
 
-popd
-
 for var in "$@"; do
     if [[ $var = "run" ]]; then
         $OUT/rive_viewer
@@ -77,3 +75,5 @@
         lldb $OUT/rive_viewer
     fi
 done
+
+popd