Use consistent styling for dialogs. #296

...d/src/org/briarproject/android/BriarFragmentActivity.java

...oid/src/org/briarproject/android/CrashReportActivity.java

...ndroid/src/org/briarproject/android/PasswordActivity.java

...rg/briarproject/android/contact/SelectContactsDialog.java

.../src/org/briarproject/android/forum/NoContactsDialog.java

.../briarproject/android/panic/PanicPreferencesFragment.java