fix(fs): match default value of create option with js documentation (#865)

* fix(fs): inconsistency in guest-js & rust side

* Update .changes/fix-fs-write-default-option.md

plugins/fs/src/commands.rs

@@ -585,7 +585,7 @@ pub struct WriteFileOptions {
     base: BaseOptions,
     #[serde(default)]
     append: bool,
-    #[serde(default)]
+    #[serde(default = "default_create_value")]
     create: bool,
     #[serde(default)]
     create_new: bool,
@@ -593,6 +593,10 @@ pub struct WriteFileOptions {
     mode: Option<u32>,
 }
 
+fn default_create_value() -> bool {
+    true
+}
+
 fn write_file_inner<R: Runtime>(
     app: AppHandle<R>,
     path: SafePathBuf,