<Swing Dev> RFR: 8263454: com.apple.laf.AquaFileChooserUI ignores the result of String.trim()

[Alexander Zvegintsev]

Looks like the original idea was to set `fallbacktext` on strings containing only spaces.

I decided to remove the `trim()` call to keep the same behavior and to allows to set such meaningless space only titles/tooltips(same as on other platforms, maybe someone want empty label for some reason).

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Commit messages:
 - initial

Changes: https://git.openjdk.java.net/jdk/pull/3136/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3136&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263454
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3136.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3136/head:pull/3136

PR: https://git.openjdk.java.net/jdk/pull/3136