ggml : remove adding extra dim timestep embedding

This commit updates the ggml_timestep_embedding function to no longer
add an extra dimension when the specified dimension is odd.

The motivation for this change is that this introduces an unnecessary
dimension when the dimension is odd, which caused an issue in the
kernels which were not expecting this extra dimension and it resulted in
uninitialized memory for the second to last dimension.

Author: danbev

ggml/src/ggml.c

@@ -4923,12 +4923,8 @@ struct ggml_tensor * ggml_timestep_embedding(
         struct ggml_tensor  * timesteps,
         int                   dim,
         int                   max_period) {
-    int actual_dim = dim;
-    if (dim % 2 != 0) {
-        actual_dim = dim + 1;
-    }
 
-    struct ggml_tensor * result = ggml_new_tensor_2d(ctx, GGML_TYPE_F32, actual_dim, timesteps->ne[0]);
+    struct ggml_tensor * result = ggml_new_tensor_2d(ctx, GGML_TYPE_F32, dim, timesteps->ne[0]);
 
     ggml_set_op_params_i32(result, 0, dim);
     ggml_set_op_params_i32(result, 1, max_period);