fix #2906: newly loaded found caches are added to the history
fix #2906: newly loaded found caches are added to the history

The `visitedDate` field indicates that a cache has been recently logged.
It was previously set from the found date when loading a cache from
geocaching.com, which caused the extra insertion.

ThibaultR/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo,samueltardieu/cgeo,madankb/cgeo,KublaikhanGeek/cgeo,Bananeweizen/cgeo,ThibaultR/cgeo,rsudev/c-geo-opensource,mucek4/cgeo,brok85/cgeo,mucek4/cgeo,vishwakulkarni/cgeo,S-Bartfast/cgeo,SammysHP/cgeo,brok85/cgeo,kumy/cgeo,marco-dev/c-geo-opensource,SammysHP/cgeo,cgeo/cgeo,S-Bartfast/cgeo,cgeo/cgeo,matej116/cgeo,ThibaultR/cgeo,xiaoyanit/cgeo,cgeo/cgeo,lewurm/cgeo,vishwakulkarni/cgeo,brok85/cgeo,matej116/cgeo,xiaoyanit/cgeo,Huertix/cgeo,S-Bartfast/cgeo,pstorch/cgeo,xiaoyanit/cgeo,vishwakulkarni/cgeo,Huertix/cgeo,KublaikhanGeek/cgeo,schwabe/cgeo,yummy222/cgeo,pstorch/cgeo,Bananeweizen/cgeo,lewurm/cgeo,kumy/cgeo,samueltardieu/cgeo,marco-dev/c-geo-opensource,KublaikhanGeek/cgeo,superspindel/cgeo,superspindel/cgeo,superspindel/cgeo,lewurm/cgeo,pstorch/cgeo,Huertix/cgeo,tobiasge/cgeo,yummy222/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,madankb/cgeo,kumy/cgeo,schwabe/cgeo,schwabe/cgeo,SammysHP/cgeo,marco-dev/c-geo-opensource,samueltardieu/cgeo,yummy222/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,madankb/cgeo,Bananeweizen/cgeo,matej116/cgeo,schwabe/cgeo,mucek4/cgeo