main/mobile-config-firefox: add pkgver to provides (MR 1507)

Fix mobile-config-firefox not replacing postmarketos-config-firefox on
upgrade. Without the pkgver in provides, apk only considers
mobile-config-firefox as virtual package name, not as replacement.

Verified with the CE factory image:

	$ sudo apk upgrade
	...
	(20/29) Purging postmarketos-config-firefox (1-r0)
	(21/29) Installing mobile-config-firefox (1.0.1-r1)
	...

main/mobile-config-firefox/APKBUILD

 pkgname=mobile-config-firefox
 pkgver=1.0.1
-pkgrel=0
+pkgrel=1
 pkgdesc="Firefox tweaks for mobile and privacy"
 url="https://gitlab.com/postmarketOS/mobile-config-firefox"
 source="
@@ -11,7 +11,7 @@ arch="noarch"
 license="GPL-3.0-or-later"
 options="!check" # No tests
 replaces="postmarketos-config-firefox"
-provides="postmarketos-config-firefox"
+provides="postmarketos-config-firefox=$pkgver"
 
 prepare() {
 	default_prepare