8263445: Duplicate key compiler.err.expected.module in compiler.properties

Reviewed-by: vromero, jlahoda

Author: asotona

src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties

@@ -2198,9 +2198,6 @@ compiler.err.enum.constant.not.expected=\
     enum constant not expected here
 
 ## The following are related in form, but do not easily fit the above paradigm.
-compiler.err.expected.module=\
-    ''module'' expected
-
 compiler.err.expected.module.or.open=\
     ''module'' or ''open'' expected