Update photoprism-install.sh (#2610)

For some reason it seems as though the binaries as part of `libheif1` install not to `/usr/local/bin` but to `/usr/local` and so were not on the path, therefore the default value of photoprism's `--heifconvert-bin` / `$PHOTOPRISM_HEIFCONVERT_BIN` (`heif-convert`) would not be resolved

install/photoprism-install.sh

@@ -27,6 +27,8 @@ $STD apt-get install -y imagemagick
 $STD apt-get install -y darktable
 $STD apt-get install -y rawtherapee
 
+echo 'export PATH=/usr/local:$PATH' >>~/.bashrc
+export PATH=/usr/local:$PATH
 msg_ok "Installed Dependencies"
 
 msg_info "Installing PhotoPrism (Patience)"