Fix: Unit tests

Riot/Modules/Pills/PillsFormatter.swift

@@ -88,7 +88,7 @@ class PillsFormatter: NSObject {
                 return
             }
 
-            var pillString: String
+            let pillString: String
             switch mode {
             case .displayname:
                 pillString = data.displayText

RiotTests/MatrixKitTests/MXKEventFormatterTests.m

@@ -423,7 +423,7 @@
         }
     }];
 
-    XCTAssertEqual(hasLink, false, @"There should be no link in this case. We let the UI manage the link");
+    XCTAssertEqual(hasLink, true, @"There should be a link, so that a Pill can be rendered for this permalink.");
 }
 
 #pragma mark - Event sender/target info