DEV: Update forward function for consistent input

[shaneahmed]

• Update forward function for consistent input.

[codecov]

Codecov Report

Merging #299 (0282a26) into develop (0d45462) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #299   +/-   ##
========================================
  Coverage    99.82%   99.82%           
========================================
  Files           53       53           
  Lines         5004     5004           
  Branches       823      823           
========================================
  Hits          4995     4995           
  Misses           2        2           
  Partials         7        7           

Impacted Files	Coverage Δ
tiatoolbox/models/architecture/hovernet.py	100.00% <100.00%> (ø)
tiatoolbox/models/architecture/unet.py	100.00% <100.00%> (ø)
tiatoolbox/models/architecture/utils.py	100.00% <100.00%> (ø)
tiatoolbox/models/architecture/vanilla.py	100.00% <100.00%> (ø)

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