Fix inconsistent pip package name

This project is released as `segment-anything-hq` in pip:

https://pypi.org/project/segment-anything-hq/

...but the setup here just said `segment_anything`, which seems to be the cause of this error message:

```
WARNING: Generating metadata for package segment-anything-hq produced metadata for project name segment-anything
```

...while trying to pip install a requirements file that had a line like this:

```
segment-anything-hq @ git+https://github.com/SysCV/sam-hq@5fd027ec559806dec9f876b56938175a63dfc625
```

Full error logs:
```
Collecting segment-anything-hq@ git+https://github.com/SysCV/sam-hq@5fd027ec559806dec9f876b56938175a63dfc625 (from -r requirements.txt (line 9))
  Cloning https://github.com/SysCV/sam-hq (to revision 5fd027e) to /private/var/folders/28/pjfz24p92bxcj5j7gsnnk9xm0000gp/T/pip-install-cmpqwucv/segment-anything-hq_bd753024d0a540f5bcb3225886933667
  Running command git clone --filter=blob:none --quiet https://github.com/SysCV/sam-hq /private/var/folders/28/pjfz24p92bxcj5j7gsnnk9xm0000gp/T/pip-install-cmpqwucv/segment-anything-hq_bd753024d0a540f5bcb3225886933667
  Running command git rev-parse -q --verify 'sha^5fd027ec559806dec9f876b56938175a63dfc625'
  Running command git fetch -q https://github.com/SysCV/sam-hq 5fd027e
  Resolved https://github.com/SysCV/sam-hq to commit 5fd027e
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
  WARNING: Generating metadata for package segment-anything-hq produced metadata for project name segment-anything. Fix your #egg=segment-anything-hq fragments.
Discarding git+https://github.com/SysCV/sam-hq@5fd027ec559806dec9f876b56938175a63dfc625: Requested segment-anything from git+https://github.com/SysCV/sam-hq@5fd027ec559806dec9f876b56938175a63dfc625 (from -r requirements.txt (line 9)) has inconsistent name: expected 'segment-anything-hq', but metadata has 'segment-anything'
```

See also: pypa/pipenv#5445 (comment)

Author: rtyley

demo/demo_hqsam.py

@@ -2,7 +2,7 @@
 import torch
 import matplotlib.pyplot as plt
 import cv2
-from segment_anything import sam_model_registry, SamPredictor
+from segment_anything_hq import sam_model_registry, SamPredictor
 import os
 
 def show_mask(mask, ax, random_color=False):

demo/demo_hqsam_light.py

@@ -2,7 +2,7 @@
 import torch
 import matplotlib.pyplot as plt
 import cv2
-from segment_anything import sam_model_registry, SamPredictor
+from segment_anything_hq import sam_model_registry, SamPredictor
 import os
 
 def show_mask(mask, ax, random_color=False):