fix: disable no-self-assign rule (#455)

Author: baseballyama

.changeset/mighty-paws-play.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": patch
+---
+
+disable `no-self-assign` rule in Svelte files

src/configs/base.ts

@@ -8,6 +8,8 @@ export = {
         // ESLint core rules known to cause problems with `.svelte`.
         "no-inner-declarations": "off", // The AST generated by svelte-eslint-parser will false positives in it rule because the root node of the script is not the `Program`.
         // "no-irregular-whitespace": "off",
+        // Self assign is one of way to update reactive value in Svelte.
+        "no-self-assign": "off",
 
         // eslint-plugin-svelte rules
         "svelte/comment-directive": "error",