fix logic to show UnifiedSearch results when federation capability exists

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/utils/CapabilitiesUtil.kt

@@ -161,7 +161,7 @@ object CapabilitiesUtil {
     }
 
     fun isUnifiedSearchAvailable(spreedCapabilities: SpreedCapability): Boolean {
-        if (hasSpreedFeatureCapability(spreedCapabilities, SpreedFeatures.FEDERATION_V1)) {
+        if (!hasSpreedFeatureCapability(spreedCapabilities, SpreedFeatures.FEDERATION_V1)) {
             return false
         }
         return hasSpreedFeatureCapability(spreedCapabilities, SpreedFeatures.UNIFIED_SEARCH)