imservice: Invoke eekboard_context_service_set_hint_purpose unconditionally

Since eekboard_context_service_set_hint_purpose() checks if the
hint or purpose changed this doesn't cause unwanted layout reloads.

Closes: #311

src/imservice.rs

@@ -153,6 +153,7 @@ pub mod c {
 
         if active_changed {
             (imservice.active_callback)(imservice.current.active);
+        }
         if imservice.current.active {
             unsafe {
                 eekboard_context_service_set_hint_purpose(
@@ -163,7 +164,6 @@ pub mod c {
             }
         }
     }
-    }
     
     // TODO: this is really untested
     #[no_mangle]