Modify module NSVCA parsing - context definition (RhBug:1926771)

With introduction of a static context, the definition of context was
changed, therefore we have to also change parsing algorithm.

https://bugzilla.redhat.com/show_bug.cgi?id=1926771

Author: j-mracek

libdnf/nsvcap.cpp

@@ -33,7 +33,7 @@ namespace libdnf {
 #define MODULE_NAME "([" GLOB ASCII_LETTERS DIGITS MODULE_SPECIAL "]+)"
 #define MODULE_STREAM MODULE_NAME
 #define MODULE_VERSION "([" GLOB DIGITS "-]+)"
-#define MODULE_CONTEXT "([" GLOB HEXADECIMAL "-]+)"
+#define MODULE_CONTEXT MODULE_NAME
 #define MODULE_ARCH MODULE_NAME
 #define MODULE_PROFILE MODULE_NAME