fix(docs-infra): fix display of AngularJS logo on the "Press kit" page in IE11 (#41183)

Previously, the AngularJS SVG logo shown on the "Press kit" page was not
displayed correctly in IE11 (see the image below).

This commit fixes it by explicitly specifying the SVG `viewBox` on the
logo.

Before: ![presskit AngularJS logo in IE11 before][1]
After: ![presskit AngularJS logo in IE11 after][2]

[1]: https://user-images.githubusercontent.com/8604205/110812629-7123b880-8290-11eb-9f71-0ae910536fa5.png
[2]: https://user-images.githubusercontent.com/8604205/110812633-7254e580-8290-11eb-896c-84f595d273b8.png

PR Close #41183

aio/src/assets/images/logos/angularjs/AngularJS-Shield.svg

@@ -12,8 +12,8 @@
    id="svg2"
    version="1.1"
    inkscape:version="0.48.4 r9939"
-   width="335.88126"
-   height="355.80875"
+   viewBox="0 0 335.88126 355.80875"
+   width="335"
    xml:space="preserve"
    sodipodi:docname="AngularJS-Shield.svg"
    inkscape:export-filename="/usr/local/google/home/stephenfluin/AngularJS-Shield.png"