fix putting KV on a string

src/custom.zig

@@ -120,9 +120,8 @@ pub const Write = struct {
         allocator: *std.mem.Allocator,
         params: *plugins.ParamMap,
     ) Write {
-        const data = params.get("data").?;
         return Write{
-            .data = data.value,
+            .data = params.get("data").?.value,
         };
     }
 
@@ -143,7 +142,7 @@ pub const Embed = struct {
     pub fn init(allocator: *std.mem.Allocator, params: *plugins.ParmaMap) @This() {
         return Embed{
             .allocator = allocator,
-            .filepath = params.get("path").?,
+            .filepath = params.get("path").?.value,
         };
     }