UI: Ctrl+E to Edit Transform

Added a shortcut to "Edit Transform", with Ctrl+E (lines 1191-1193).
Editing was very easy in OBS Classic, and I could not find the option
for stretching a source to bounds in OBS Studio, so the "Edit Transform"
dialogue should be more user-facing. Giving it a keyboard shortcut
denotes that it is important enough to have a shortcut, as opposed
to the myriad options with no shortcut

UI/forms/OBSBasic.ui

@@ -1188,6 +1188,9 @@
    <property name="text">
     <string>Basic.MainMenu.Edit.Transform.EditTransform</string>
    </property>
+   <property name="shortcut">
+    <string>Ctrl+E</string>
+   </property>
   </action>
   <action name="actionCopyTransform">
    <property name="text">