main/postmarketos-ui-phosh: recommend Evince (MR 3869)

Otherwise we don't have any document viewer installed by default.

[ci:skip-vercheck]: pkgrel bump is not necessary when changing
recommends.
[ci:skip-build]: already built successfully in CI

main/postmarketos-ui-phosh/APKBUILD

@@ -30,6 +30,7 @@ _pmb_recommends="
 	calls
 	chatty
 	eog
+	evince
 	firefox-esr
 	font-noto
 	font-noto-emoji