Update saveFooterPosition to only update position if the current task is active

[andreia-ferreira]

The progress bar was misaligned in some devices, probably due to the fact that, since view pagers preload neighbor fragments, they might also trigger position updates for the footer position. This PR adds a extra check in saveFooterPosition, to make sure that only the current active task's footer drives the guideline

Before:

Screen_recording_20260413_152950.webm

After:

Screen_recording_20260413_152459.webm

@shobhitagarwal1612 PTAL?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.62%. Comparing base (3f3f863) to head (9622bcc).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3667   +/-   ##
=========================================
  Coverage     67.61%   67.62%           
- Complexity     1620     1623    +3     
=========================================
  Files           364      364           
  Lines          9129     9133    +4     
  Branches       1169     1171    +2     
=========================================
+ Hits           6173     6176    +3     
- Misses         2305     2306    +1     
  Partials        651      651           

Files with missing lines	Coverage Δ
...id/ui/datacollection/tasks/AbstractTaskFragment.kt	79.34% <100.00%> (+0.93%)	⬆️

... and 1 file with indirect coverage changes

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[shobhitagarwal1612]

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