nano-syntax-highlighting: fix nanorc.sample (#5645)

Arch did generation wrong, and I didn't test it (sorry :( ). `find` returns relative path, which is
${lang}.nanorc, so seding is just simply putting `include ` in the beginning of each line

nano-syntax-highlighting/PKGBUILD

@@ -4,7 +4,7 @@ pkgname=nano-syntax-highlighting
 conflicts=(${pkgname}-git)
 replaces=(${pkgname}-git)
 pkgver=2025.07.01
-pkgrel=1
+pkgrel=2
 pkgdesc="Nano editor syntax highlighting enhancements"
 arch=('any')
 depends=('nano')
@@ -20,8 +20,8 @@ prepare() {
 }
 
 build() {
-	cd "${pkgname}-${pkgver}"
-	find *.nanorc -type f | sed "s@${srcdir}\/nanorc@include \/usr\/share\/${pkgname}@" > nanorc.sample
+  cd "${pkgname}-${pkgver}"
+  find *.nanorc -type f | sed "s@^@include /usr/share/${pkgname}/@" > nanorc.sample
 }
 
 package() {