RFR: 8233798: Ctrl-L character mistakenly removed from gstreamer.md

[Kevin Rushforth]

Fix for [JDK-8233798](https://bugs.openjdk.java.net/browse/JDK-8233798)

Simple fix to restore a Ctrl-L character that was mistakenly deleted as part of the cleanup fix done for [JDK-8222746](https://bugs.openjdk.java.net/browse/JDK-8222746). After the missing ^L is restored the license is once again identical between `gstreamer.md` and `glib.md` (and `webkit.md`) as it should be.

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Commits:
 - d09255bc: 8233798: Ctrl-L character mistakenly removed from gstreamer.md

Changes: https://git.openjdk.java.net/jfx/pull/80/files
 Webrev: https://webrevs.openjdk.java.net/jfx/80/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233798
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/80.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/80/head:pull/80

PR: https://git.openjdk.java.net/jfx/pull/80