Prepend instdir/program to the PATH in bin/run

To avoid problems described in 21cf443235,
do not change directory.

Change-Id: I56590c4728a6505c089a5bc06bed2a31a0cd0362
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156973
Tested-by: Hossein <hossein@libreoffice.org>
Reviewed-by: Hossein <hossein@libreoffice.org>

bin/run

@@ -71,9 +71,8 @@ if uname | grep -i CYGWIN >/dev/null; then
 
     exedir=$(cygpath -m "${dir}"/workdir/LinkTarget/Executable)
     export URE_BOOTSTRAP=file:///$(cygpath -m "${dir}")/instdir/program/fundamental.ini
-    export PATH=${PATH:+$PATH:}"${dir}"/instdir/program
+    export PATH="${dir}/instdir/program${PATH:+:$PATH}"
     SEARCH_PATH="${PATH}"
-    cd instdir/program
 
 elif [ $(uname) = Darwin ]; then