Change tempalte character case from EXIF to Exif (commons-app#3330)

Author: mds08011

app/src/main/java/fr/free/nrw/commons/contributions/Contribution.java

@@ -23,8 +23,8 @@
 
 public class  Contribution extends Media {
 
-    //{{According to EXIF data|2009-01-09}}
-    private static final String TEMPLATE_DATE_ACC_TO_EXIF = "{{According to EXIF data|%s}}";
+    //{{According to Exif data|2009-01-09}}
+    private static final String TEMPLATE_DATE_ACC_TO_EXIF = "{{According to Exif data|%s}}";
 
     //2009-01-09 → 9 January 2009
     private static final String TEMPLATE_DATA_OTHER_SOURCE = "%s";