[lldb][test] TestFrameFormat: set breakpoints by name

Without this for some reason Linux PR CI was failing with:
```
 (lldb) settings set -f frame-format "custom-frame '${function.basename}'\n"
check:50'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:50'1                                          ?                                       possible intended match
            9: (lldb) break set -l 5 -f main.cpp
check:50'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           10: Breakpoint 1: no locations (pending).
check:50'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           11: WARNING: Unable to resolve breakpoint to any actual locations.
check:50'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

(cherry picked from commit 10f379e)

Author: Michael137

lldb/test/Shell/Settings/TestFrameFormatFunctionBasename.test

@@ -42,7 +42,7 @@ int main() {
 
 #--- commands.input
 settings set -f frame-format "custom-frame '${function.basename}'\n"
-break set -l 5 -f main.cpp
+break set -n bar
 
 run
 bt

lldb/test/Shell/Settings/TestFrameFormatFunctionTemplateArguments.test

@@ -33,7 +33,7 @@ int main() { return bar(); }
 
 #--- commands.input
 settings set -f frame-format "custom-frame '${function.template-arguments}'\n"
-break set -l 4 -f main.cpp
+break set -n func
 
 run
 bt