Add missing explicit return

Why the heck do C++ compilers permit the lack of an explicit return statement outside void()...? Just calling it "undefined behavior" is *not* developer friendly.

Author: TheAssassin

src/deployers/PrintSupportPluginsDeployer.cpp

@@ -21,4 +21,6 @@ bool PrintSupportPluginsDeployer::deploy() {
         if (!appDir.deployLibrary(*i, appDir.path() / "usr/plugins/printsupport/"))
             return false;
     }
+
+    return true;
 }