fix broken --ckpt_convert option

- not sure why, but at some pont --ckpt_convert (which converts legacy checkpoints)
  into diffusers in memory, stopped working due to float16/float32 issues.

- this commit repairs the problem

- also removed some debugging messages I found in passing

ldm/invoke/generator/base.py

@@ -336,7 +336,6 @@ class Generator:
         if self.caution_img:
             return self.caution_img
         path = Path(web_assets.__path__[0]) / CAUTION_IMG
-        print(f'DEBUG: path to caution = {path}')
         caution = Image.open(path)
         self.caution_img = caution.resize((caution.width // 2, caution.height //2))
         return self.caution_img

ldm/invoke/generator/omnibus.py

@@ -40,8 +40,6 @@ class Omnibus(Img2Img,Txt2Img):
         self.perlin = perlin
         num_samples = 1
 
-        print('DEBUG: IN OMNIBUS')
-
         sampler.make_schedule(
             ddim_num_steps=steps, ddim_eta=ddim_eta, verbose=False
         )