Blacklist Nexus 5 from OpenSL ES

Fixes #6432
// FREEBIE

src/org/thoughtcrime/securesms/ApplicationContext.java

@@ -183,6 +183,7 @@ public class ApplicationContext extends MultiDexApplication implements Dependenc
 
     Set<String> OPEN_SL_ES_BLACKLIST = new HashSet<String>() {{
       add("MI 4LTE"); // Xiami Mi4 #6241
+      add("Nexus 5"); // Nexus 5 #6432
     }};
 
     if (Build.VERSION.SDK_INT >= 11) {