Terminal: Fix qbs build

Amends 66094398fb.

Change-Id: I14370d18e0f9b0ab0ef7434503956c2bfa7d7029
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/terminal/terminal.qbs

@@ -4,6 +4,7 @@ QtcPlugin {
     name: "Terminal"
 
     Depends { name: "Core" }
+    Depends { name: "ProjectExplorer" }
     Depends { name: "vterm" }
     Depends { name: "ptyqt" }