Fixed defects

List of Defects

Error: CLANG_WARNING: [#def1]
vim91/src/drawline.c:2134:9: warning[deadcode.DeadStores]: Value stored to 'display_text_first' is never read
# 2132|   				text_prop_follows = TRUE;
# 2133|   				if (used_tpi < 0)
# 2134|-> 				    display_text_first = TRUE;
# 2135|   				continue;
# 2136|   			    }

Error: CLANG_WARNING: [#def2]
vim91/src/drawline.c:2148:8: warning[deadcode.DeadStores]: Value stored to 'display_text_first' is never read
# 2146|   			    text_prop_id = tp->tp_id;
# 2147|   			    used_tpi = tpi;
# 2148|-> 			    display_text_first = FALSE;
# 2149|   			}
# 2150|   		    }

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