nixos/atlassian: Fix eval error in jrePackage

The error got introduced by 4f3d971ef5,
which removed the *Text attributes from the option.

This in turn leads to an evaluation error while building the
manual/manpage, because oraclejre8 is marked unfree.

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @jbgi, @orivej, @globin

nixos/modules/services/web-apps/atlassian/confluence.nix

@@ -130,6 +130,7 @@ in
       jrePackage = mkOption {
         type = types.package;
         default = pkgs.oraclejre8;
+        defaultText = "pkgs.oraclejre8";
         description = "Note that Atlassian only support the Oracle JRE (JRASERVER-46152).";
       };
     };

nixos/modules/services/web-apps/atlassian/crowd.nix

@@ -96,6 +96,7 @@ in
       jrePackage = mkOption {
         type = types.package;
         default = pkgs.oraclejre8;
+        defaultText = "pkgs.oraclejre8";
         description = "Note that Atlassian only support the Oracle JRE (JRASERVER-46152).";
       };
     };

nixos/modules/services/web-apps/atlassian/jira.nix

@@ -134,6 +134,7 @@ in
       jrePackage = mkOption {
         type = types.package;
         default = pkgs.oraclejre8;
+        defaultText = "pkgs.oraclejre8";
         description = "Note that Atlassian only support the Oracle JRE (JRASERVER-46152).";
       };
     };