programs.khal: add "addresses" option + tidy up (#5221)

- Add `accounts.<calendar|contact>.accounts.<name>.khal.addresses`
  option to enable new configuration option, "addresses", from khal,
  which is used for showing participation status [1].
- Remove mistaken new line in khal implementation, refer to [2].
- Make additions to the existing test case to check the new addresses
  feature. And remove the empty lines in expected configs.

[1]: https://khal.readthedocs.io/en/latest/configure.html#the-calendars-section
[2]: https://github.com/nix-community/home-manager/pull/5192#pullrequestreview-1975091763

tests/modules/programs/khal/config.nix

@@ -30,6 +30,34 @@
           url = "https://example.com/events.ical";
         };
       };
+      testWithAddresss = {
+        khal = {
+          enable = true;
+          addresses = [ "john.doe@email.com" ];
+        };
+        local = {
+          type = "filesystem";
+          fileExt = ".ics";
+        };
+        remote = {
+          type = "http";
+          url = "https://example.com/events.ical";
+        };
+      };
+      testWithMultipleAddresss = {
+        khal = {
+          enable = true;
+          addresses = [ "john.doe@email.com" "another.brick@on.the.wall" ];
+        };
+        local = {
+          type = "filesystem";
+          fileExt = ".ics";
+        };
+        remote = {
+          type = "http";
+          url = "https://example.com/events.ical";
+        };
+      };
     };
   };
 

tests/modules/programs/khal/khal-config-expected

@@ -1,7 +1,6 @@
 [calendars]
 [[test]]
 path = /home/hm-user/$XDG_CONFIG_HOME/cal/test/
-        
 readonly = True
 color = '#ff0000'
 priority=10
@@ -9,9 +8,24 @@ type=calendar
 
 
 
+[[testWithAddresss]]
+path = /home/hm-user/$XDG_CONFIG_HOME/cal/testWithAddresss/
+addresses= john.doe@email.com
+priority=10
+type=calendar
+
+
+
+[[testWithMultipleAddresss]]
+path = /home/hm-user/$XDG_CONFIG_HOME/cal/testWithMultipleAddresss/
+addresses= john.doe@email.com, another.brick@on.the.wall
+priority=10
+type=calendar
+
+
+
 [[testcontacts-automaticallyCollected]]
 path = /home/hm-user/$XDG_CONFIG_HOME/card/testcontacts/automaticallyCollected
-        
 priority=10
 type=birthdays
 
@@ -19,7 +33,6 @@ type=birthdays
 
 [[testcontacts-default]]
 path = /home/hm-user/$XDG_CONFIG_HOME/card/testcontacts/default
-        
 priority=10
 type=birthdays
 
@@ -27,7 +40,6 @@ type=birthdays
 
 [[testcontactsNoCollections]]
 path = /home/hm-user/$XDG_CONFIG_HOME/card/testcontactsNoCollections/
-        
 priority=10
 type=birthdays