[opt_in] Tiny improvements to make exporting easier.

[torotil]

A few tiny improvements that are needed for moreonion/campaignion_logcrm#12

[codecov]

Codecov Report

Merging #265 (2329494) into 7.x-2.x (a20df7e) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             7.x-2.x     #265      +/-   ##
=============================================
+ Coverage      46.18%   46.33%   +0.14%     
- Complexity      1878     1880       +2     
=============================================
  Files            288      288              
  Lines          10162    10192      +30     
  Branches         154      154              
=============================================
+ Hits            4693     4722      +29     
- Misses          5466     5467       +1     
  Partials           3        3              

Impacted Files	Coverage Δ	Complexity Δ
campaignion_opt_in/campaignion_opt_in.module	91.52% <100.00%> (+0.29%)	0.00 <0.00> (ø)
campaignion_opt_in/src/Values.php	99.01% <100.00%> (ø)	44.00 <0.00> (ø)
src/CRM/Import/Field/BooleanOptIn.php	68.75% <0.00%> (-9.83%)	8.00% <0.00%> (ø%)
src/CRM/Import/Field/Address.php	94.73% <0.00%> (+3.43%)	38.00% <0.00%> (+2.00%)

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