[BUGFIX] follow up to "Improve usability of new Media element flexform"

Due to a superfluous displayCondition the field for actual insertion of
HTML5-video-sources is not shown correctly.

Change-Id: I8cd43b9dba4b97a286ec24641fd4812577beaf43
Fixes: #35433
Releases: 4.7,6.0
Reviewed-on: http://review.typo3.org/10226
Reviewed-by: Susanne Moog
Tested-by: Susanne Moog
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer

typo3/sysext/cms/flexform_media.xml

@@ -243,7 +243,6 @@
 									<mmSource>
 										<TCEforms>
 											<label>LLL:EXT:cms/locallang_ttc.xml:media.url</label>
-											<displayCond>FIELD:mmType:=:video</displayCond>
 											<config>
 												<type>input</type>
 												<size>60</size>