Mat: Material editor can't be opened from FEM_MaterialSolid and FEM_MaterialFluid

This fixes #12949.

* The file materials-editor.ui must be installed with a separate INSTALL command because it goes to another directory than the other resource files.
* Material_rc.py isn't copied to the build directory any more. So, then don't install it either.

src/Mod/Material/CMakeLists.txt

@@ -14,10 +14,13 @@ SET(MaterialScripts_Files
     importFCMat.py
     MaterialEditor.py
     TestMaterialsApp.py
-    Resources/ui/materials-editor.ui
     Templatematerial.yml
 )
 
+SET(Material_Ui_Files
+    Resources/ui/materials-editor.ui
+)
+
 # SOURCE_GROUP("MaterialScripts" FILES ${MaterialScripts_Files})
 SET(MaterialTools_Files
     materialtools/__init__.py
@@ -292,15 +295,17 @@ fc_target_copy_resource(MateriaTestLib
     ${MaterialTest_Files})
 
 ADD_CUSTOM_TARGET(MaterialScripts ALL
-    SOURCES ${MaterialScripts_Files} ${Material_QRC_SRCS}
+    SOURCES ${MaterialScripts_Files} ${Material_Ui_Files} ${Material_QRC_SRCS}
 )
 
 fc_target_copy_resource(MaterialScripts
     ${CMAKE_CURRENT_SOURCE_DIR}
     ${CMAKE_BINARY_DIR}/Mod/Material
-    ${MaterialScripts_Files})
+    ${MaterialScripts_Files}
+    ${Material_Ui_Files})
 
 INSTALL(FILES ${MaterialScripts_Files} DESTINATION Mod/Material)
+INSTALL(FILES ${Material_Ui_Files} DESTINATION Mod/Material/Resources/ui)
 
 ADD_CUSTOM_TARGET(MaterialToolsLib ALL
     SOURCES ${MaterialTools_Files}
@@ -369,11 +374,6 @@ fc_target_copy_resource(MaterialModelLib
     ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_DATADIR}/Mod/Material/
     ${MaterialModel_Files})
 
-INSTALL(
-    FILES ${Material_SRCS} ${Material_QRC_SRCS}
-    DESTINATION Mod/Material
-)
-
 INSTALL(
     FILES ${MaterialTest_Files}
     DESTINATION Mod/Material/materialtests