Fix two manual tests qmake project files

Fixes incorrect target name for styles test.

Explicit reference of widgets and opengl libraries in dialog.pri. While
not necessary for qmake it makes our lives easier when running the
CMake conversion script.

Change-Id: I036cae9d801c80c5817421b8427fc5c91e2f7883
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

tests/manual/diaglib/diaglib.pri

@@ -28,14 +28,17 @@ contains(QT, widgets) {
         $$PWD/qwidgetdump.cpp \
         $$PWD/debugproxystyle.cpp \
         $$PWD/logwidget.cpp
+    QT += widgets-private
 }
 
 contains(QT, opengl) {
-HEADERS += \
-    $$PWD/glinfo.h
+    HEADERS += \
+        $$PWD/glinfo.h
 
-SOURCES += \
-    $$PWD/glinfo.cpp
+    SOURCES += \
+        $$PWD/glinfo.cpp
+
+    QT += opengl
 }
 
 DEFINES += QT_DIAG_LIB

tests/manual/widgets/styles/styles.pro

@@ -1,5 +1,6 @@
 TEMPLATE = app
-QT = tst_manual_widgets
+QT = widgets
+TARGET = tst_manual_styles
 CONFIG += cmdline
 CONFIG += c++11