removed redundant brackets in the translated specification

src/main/java/de/tlc4b/analysis/PrecedenceCollector.java

src/main/java/de/tlc4b/prettyprint/TLAPrinter.java

src/test/java/de/tlc4b/analysis/ConstantsTest.java

src/test/java/de/tlc4b/prettyprint/SetTest.java