Add js-ts-mode to dtrt-indent-hook-mapping-list

Author: kirikaza

dtrt-indent.el

@@ -391,6 +391,7 @@ quote, for example.")
     (gpr-ts-mode     ada           gpr-ts-mode-indent-offset)
     (java-ts-mode    c/c++/java    java-ts-mode-indent-offset)
     (rust-ts-mode    c/c++/java    rust-ts-mode-indent-offset)
+    (js-ts-mode      javascript    js-indent-level)
     (json-ts-mode    javascript    json-ts-mode-indent-offset)
     (cmake-ts-mode   cmake         cmake-ts-mode-indent-offset)
     (typescript-ts-base-mode javascript typescript-ts-mode-indent-offset)