Dump waybar config to semi-permanent destination

Since a previous change combined all displays into a single file, it is
no longer necessary to create many temporary configs. The latest config
can just be dumped to the standard path so that running `waybar` on it's
own will load it.

sway/displays.pl

@@ -30,8 +30,8 @@
 # "width": __WIDTH__ (optional)
 my $waybar_template = "$ENV{'HOME'}/.config/waybar/config.template";
 
-# Temporary directory to save generated waybar config(s)
-my $waybar_temporary = '/tmp';
+# Path to actual config file generated from template
+my $waybar_config = "$ENV{'HOME'}/.config/waybar/config";
 
 # File to log and recover last used layout name
 my $last = "$ENV{'HOME'}/.config/last_display";
@@ -382,12 +382,8 @@ unless ($pid) {
         open STDOUT, '>>/dev/null';
         open STDERR, '>>/dev/null';
         # Write config to a temporary file
-        my $tmp = $waybar_temporary . "/waybar-" . time() .".config";
-        open ($fh, '>', $tmp);
+        open ($fh, '>', $waybar_config);
         print $fh $waybar;
         close $fh;
-        `nohup waybar --config=$tmp >> waybar.log`;
-
-        # Remove config
-        unlink $tmp;
+        `nohup waybar --config=$waybar_config >> waybar.log`;
 }