Fix cutting of paths with equals signs

Cut splits by equals sign and takes the second field. This ignores path
contents after a second equals sign. Currently this prevents the
installation on NixOS as the nix store path automatically contains a
"=".

This PR instead selects all but the first field and equals sign, leaving
the passed paths as intended.

bin/install

@@ -54,13 +54,13 @@ Options:
         set -g OMF_CHANNEL dev
 
       case '--channel=*'
-        abort "Unknown release channel \""(echo "$argv[1]" | command cut -d= -f2)"\"."
+        abort "Unknown release channel \""(echo "$argv[1]" | command cut -d= -f2-)"\"."
 
       case --check
         set -g CHECK_ONLY
 
       case '--config=*'
-        echo "$argv[1]" | command cut -d= -f2 | command sed -e "s#~#$HOME#" | read -g OMF_CONFIG
+        echo "$argv[1]" | command cut -d= -f2- | command sed -e "s#~#$HOME#" | read -g OMF_CONFIG
 
       case --noninteractive
         set -g NONINTERACTIVE
@@ -70,10 +70,10 @@ Options:
 
       case '--offline=*'
         set -g OFFLINE
-        echo "$argv[1]" | command cut -d= -f2 | command sed -e "s#~#$HOME#" | read -g OFFLINE_PATH
+        echo "$argv[1]" | command cut -d= -f2- | command sed -e "s#~#$HOME#" | read -g OFFLINE_PATH
 
       case '--path=*'
-        echo "$argv[1]" | command cut -d= -f2 | command sed -e "s#~#$HOME#" | read -g OMF_PATH
+        echo "$argv[1]" | command cut -d= -f2- | command sed -e "s#~#$HOME#" | read -g OMF_PATH
 
       case --uninstall
         set -g UNINSTALL

bin/install.sha256

@@ -1 +1 @@
-c55853fcc09956fbea8f006a5b86705c71b879348a9240d8f014d0c81233ccf2  install
+429a76e5b5e692c921aa03456a41258b614374426f959535167222a28b676201  install