Fix limit on rule parameters and fix segfault in applyScrobbleRule

For sure this time

src/apply_rule.zig

@@ -61,7 +61,11 @@ pub fn applyScrobbleRule(allocator: std.mem.Allocator, scrobble: Data.ImportedSc
                     },
                     .replace => switch (act.action_on) {
                         inline .album, .track => |on| @field(output_scrobble, @tagName(on)) = act.action_txt,
-                        inline .artists_album, .artists_track => |on| @field(output_scrobble, @tagName(on)) = &[_][]const u8{act.action_txt},
+                        inline .artists_album, .artists_track => |on| {
+                            const artist = try allocator.alloc([]const u8, 1);
+                            artist[0] = act.action_txt;
+                            @field(output_scrobble, @tagName(on)) = artist;
+                        },
                     },
                 }
             }

src/main.zig

@@ -14,10 +14,13 @@ pub const jetzig_options = struct {
         // htmx middleware skips layouts when `HX-Target` header is present and issues
         // `HX-Redirect` instead of a regular HTTP redirect when `request.redirect` is called.
         jetzig.middleware.HtmxMiddleware,
-        // Demo middleware included with new projects. Remove once you are familiar with Jetzig's
+            // Demo middleware included with new projects. Remove once you are familiar with Jetzig's
-        // middleware system.
+            // middleware system.
     };
 
+    // This is currently the largest number of parameters one can have in a rule
+    pub const max_multipart_form_fields = 42;
+
     // Maximum bytes to allow in request body.
     pub const max_bytes_request_body: usize = std.math.pow(usize, 2, 24);