[MM-54639] Help menu should open correctly aligned (#24655)

* remove openLeft

* remove prop usage

* revert menu

* change user guide dropdown

* update snapshot

webapp/channels/src/components/global_header/center_controls/user_guide_dropdown/__snapshots__/user_guide_dropdown.test.tsx.snap

@@ -44,7 +44,7 @@ exports[`components/channel_header/components/UserGuideDropdown should match sna
   <Menu
     ariaLabel="Add Channel Dropdown"
     id="AddChannelDropdown"
-    openLeft={true}
+    openLeft={false}
     openUp={false}
   >
     <MenuGroup>
@@ -122,7 +122,7 @@ exports[`components/channel_header/components/UserGuideDropdown should match sna
   <Menu
     ariaLabel="Add Channel Dropdown"
     id="AddChannelDropdown"
-    openLeft={true}
+    openLeft={false}
     openUp={false}
   >
     <MenuGroup>
@@ -193,7 +193,7 @@ exports[`components/channel_header/components/UserGuideDropdown should match sna
   <Menu
     ariaLabel="Add Channel Dropdown"
     id="AddChannelDropdown"
-    openLeft={true}
+    openLeft={false}
     openUp={false}
   >
     <MenuGroup>

webapp/channels/src/components/global_header/center_controls/user_guide_dropdown/user_guide_dropdown.tsx

@@ -146,7 +146,7 @@ class UserGuideDropdown extends React.PureComponent<Props, State> {
                     />
                 </OverlayTrigger>
                 <Menu
-                    openLeft={true}
+                    openLeft={false}
                     openUp={false}
                     id='AddChannelDropdown'
                     ariaLabel={intl.formatMessage({id: 'sidebar_left.add_channel_dropdown.dropdownAriaLabel', defaultMessage: 'Add Channel Dropdown'})}