[lldb] Remove tab from TestReturnValue.py

Mixing tabs and spaces makes Python exit with this error:

  File "llvm/lldb/packages/Python/lldbsuite/test/functionalities/return-value/TestReturnValue.py", line 23
    return (self.getArchitecture() == "aarch64" and self.getPlatform() == "linux")
                                                                                 ^
TabError: inconsistent use of tabs and spaces in indentation

Author: Teemperor

lldb/packages/Python/lldbsuite/test/functionalities/return-value/TestReturnValue.py

@@ -20,7 +20,7 @@ def affected_by_pr33042(self):
             "aarch64" and self.getPlatform() == "linux")
 
     def affected_by_pr44132(self):
-	return (self.getArchitecture() == "aarch64" and self.getPlatform() == "linux")
+        return (self.getArchitecture() == "aarch64" and self.getPlatform() == "linux")
 
     # ABIMacOSX_arm can't fetch simple values inside a structure
     def affected_by_radar_34562999(self):