RFR: 8279795: Fix typo in BasicFileChooserUI: Constucts -> Constructs

[Alexey Ivanov]

Fix the typo in the constructor for BasicFileChooserUI.DoubleClickListener: ‘Constucts’ → ‘Constructs’.
Also fixed the typo in the parameter of the constructor: ‘the lsit’ → ‘the list’.

I also organised the imports which replaced all wildcard imports with specific class imports.

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Commit messages:
 - 8279795: Fix typo in BasicFileChooserUI: Constucts -> Constructs

Changes: https://git.openjdk.java.net/jdk/pull/7030/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7030&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279795
  Stats: 54 lines in 1 file changed: 37 ins; 0 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7030.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7030/head:pull/7030

PR: https://git.openjdk.java.net/jdk/pull/7030