Update preset to use single quote

Author: shahmishal

utils/build-presets.ini

@@ -303,7 +303,7 @@ lldb-assertions
 [preset: buildbot_incremental_base]
 test
 validation-test
-lit-args="-v --time-tests"
+lit-args='-v --time-tests'
 
 compiler-vendor=apple
 
@@ -775,7 +775,7 @@ foundation
 libdispatch
 indexstore-db
 sourcekit-lsp
-lit-args="-v --time-tests"
+lit-args='-v --time-tests'
 
 dash-dash