Fix stale search results by incrementing rev after adding a photo

[jwalgran]

Searches results for trees or green infrastructure resources with missing photos were not updating after adding photos. I resolved this by ensuring that we increment the universal_rev after adding a photo.

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Testing

• Create an instance with green infrastructure and enable the GI features.
• Add 2 trees and a GI resource.
• Search for missing photos, should match 2 trees and 1 resource.
• In a separate tab, load the detail page for the GI resource and add a photo.
• Refresh the search page. The missing photo count should drop to 2 trees and 0 resources.
• Repeat the process and add a photo to a tree. The count should drop to 1 tree and 0 resources.
• Use a mobile app to add a photo to the remaining tree. After refreshing the map page the count should drop to 0 trees and 0 resources.

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Connects to #3126

[coveralls]

Coverage decreased (-0.007%) to 83.784% when pulling 8589e152fda90a8a0a64c4d02a1fcbeddc4d4b3b on jwalgran:feature/adding-photo-increments-rev into b256612d62e0f02acb72d3ab9bb838254ff313aa on OpenTreeMap:develop.