On change of map layer, save new layer to local storage

[ddrury]

• Added a name property to each layer object.
• Added leafletjs.baselayerchange() function to the map which when it fires saves the name property to local storage.
• On page load use the stored value to set the displayed layer.
• Tidy formatting in Bing maps module (unrelated to above)

[codecov[bot]]

Codecov Report

Merging #4165 (ed4e614) into main (64fe0e9) will decrease coverage by 0.02%. The diff coverage is 30.00%.

@@             Coverage Diff              @@
##               main    #4165      +/-   ##
============================================
- Coverage     31.75%   31.73%   -0.03%     
+ Complexity    11119    11102      -17     
============================================
  Files          1106     1106              
  Lines         39106    39103       -3     
============================================
- Hits          12417    12408       -9     
- Misses        26689    26695       +6     

Impacted Files	Coverage Δ
app/Module/IndividualFactsTabModule.php	0.00% <0.00%> (ø)
app/Module/PlaceHierarchyListModule.php	0.00% <0.00%> (ø)
app/Statistics.php	93.66% <ø> (+0.29%)	:arrow_up:
app/Statistics/Repository/MediaRepository.php	100.00% <ø> (ø)
app/Statistics/Google/ChartDistribution.php	45.00% <24.67%> (+3.03%)	:arrow_up:
app/Module/IndividualListModule.php	50.50% <55.55%> (+0.12%)	:arrow_up:
app/Statistics/Repository/PlaceRepository.php	98.98% <94.73%> (+10.61%)	:arrow_up:

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[ddrury]

See also https://github.com/fisharebest/webtrees/pull/4727 and https://github.com/fisharebest/webtrees/pull/4703

As this PR provides a method to save a users preferred map provider and layer to local storage it mitigates the problem whereby the default layer may change depending on how the map providers are enabled/disabled in the control panel, therefore the defaultLayer concept becomes redundant and the associated code can be removed.