fix: Fixed demo app

[fg-mindee]

This PR introduces the following modifications:

• fixed demo app with the recent changes in model call method
• enforced training=False in evaluation and analysis scripts

Any feedback is welcome!

[charlesmindee]

Thanks!

[codecov]

Codecov Report

Merging #252 (a112c8f) into main (ffe3c2f) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
+ Coverage   96.93%   96.98%   +0.05%     
==========================================
  Files          45       45              
  Lines        1923     1923              
==========================================
+ Hits         1864     1865       +1     
+ Misses         59       58       -1     

Flag	Coverage Δ
unittests	96.98% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tr/models/detection/differentiable_binarization.py	94.06% <0.00%> (+0.42%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ffe3c2f...a112c8f. Read the comment docs.