MUZIMA-167 : Apply standard form template layout and validation to Histo...

Below are the changes done in Histopathology.html form.
1. Replaced Screening Site drop down field to autocomplete text box under Encounter Details section.
2. Moved comment field to below of the form.
3. Added autocomplete to Provider Name.
4. Removed additional Encounter Date from provider section.
5. Made Patient Demographics section's fields as non-editable.