storage: Set more aggressive cache expiration values

I am setting the expiration values lower because it seems that the previous values were not keeping storage usage low enough.

Testing: Testing will be performed as a long-term test on Github issue #1689 (https://github.com/damus-io/damus/issues/1689)
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Util/Extensions/KFOptionSetter+.swift

@@ -30,13 +30,13 @@ extension KFOptionSetter {
         
         switch imageContext {
             case .pfp:
-                options.diskCacheExpiration = .never
+                options.diskCacheExpiration = .days(60)
                 break
             case .banner:
-                options.diskCacheExpiration = .days(14)
+                options.diskCacheExpiration = .days(5)
                 break
             case .note:
-                options.diskCacheExpiration = .days(7)
+                options.diskCacheExpiration = .days(1)
                 break
         }