Fix doubled line in baselines

projects/SelfTest/Baselines/junit.sw.approved.txt

@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<?xml version="1.0" encoding="UTF-8"?>
 <testsuitesloose text artifact
 >
   <testsuite name="<exe-name>" errors="17" failures="106" tests="1019" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">

projects/SelfTest/Baselines/xml.sw.approved.txt

@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<?xml version="1.0" encoding="UTF-8"?>
 <Catch name="<exe-name>">
   <Group name="<exe-name>">
     <TestCase name="# A test name that starts with a #" filename="projects/<exe-name>/UsageTests/Misc.tests.cpp" >