fix: fix food Item repository

[alextheprophecy]

PR: fix food item repository

Changes in FoodItemRepositoryFirestore.kt:

• Updated convertToFoodItem, convertToFoodItemFromMap, convertFoodItemToMap
• They now all properly convert the location, openDate and buyDate, and properly save all the relevant data to Firebase

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud